Creativity Beyond Chemistry | |
Production • Distribution • Sourcing • Logistics • Consulting | |
Our hybrid business model, combining manufacturing with sourcing and exclusive distribution agreements, results in a superior level of purchasing power that when added to our global warehouse network with locations near all major flavor and fragrance industry compounding centers around the globe, make A.C.S. International your one-stop sourcing partner. | |
Email: | Info |
US Email: | Armin Schmidt |
Email: | Nathalie Pinel |
US Email: | Armin Schmidt |
Voice: +49 (0) 55 31 - 99 06-0 | |
Fax: +49 (0)5531 9906 199 | |
Operational Capabilities | |
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Product(s): | |
50905 Indole |
Inspired by Nature | |
A diverse range of products, all meeting our stringent commitment to quality. | |
Advanced Biotech is a leading manufacturer and supplier of high-quality Natural flavoring ingredients & botanical extracts for the food/beverage, cosmetic and personal care industries. With over 25 years of experience working with Fermentation processing & botanical extracts, we can help develop new innovative and functional products for today’s competitive marketplace. Our company prides itself in the ability to cater to our customer’s specific needs while maintaining our focus on integrity, honesty and the commitment to high quality product standards. We proudly offer our quality Natural ingredients to companies around the world. | |
US Email: | Info |
US Email: | Quotes and Orders |
US Voice: 973-339-6242 | |
US Fax: 973-256-4101 | |
Upcoming Events | |
Blog | |
Vimeo | |
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Product(s): | |
1431 INDOLE 1% IN PG NATURAL | |
SDS | |
1273 INDOLE NATURAL 97% min. | |
SDS | |
1322 INDOLE 0.6% IN ETOH NATURAL | |
SDS | |
1209 INDOLE 1% IN ETOH NATURAL | |
SDS |
Let's get reacquainted | |
Building great taste with aroma chemicals, extracts, and distillates | |
The Alfrebro brand was established in the early 1900s by Alex Fries & Brothers, a Cincinnati Flavor Company. In 1980, the brand was re-launched as an aroma chemical manufacturer. Since its inception, Alfrebro’s primary focus has been to provide quality natural and high value synthetic chemicals. | |
Email: | Sarah Forbis |
Email: | Sales |
Voice: 513-539-3021 | |
Fax: 513-539-7372 | |
US Voice: 513-539-7373 | |
Newsroom | |
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Product(s): | |
INDOLE (EU NAT) | |
INDOLE (EU NAT) | |
INDOLE NATURAL 1% IN ETHANOL |
The Premier Supplier | |
Augustus Oils Ltd, in harmony with nature - to present it at its best... | |
A wealth of experience, expertise and knowledge has allowed Augustus to bridge the gulf in expectation and trust between growers and users of natural ingredients. The Company works in partnership with customers on the one hand, and growers, farmers and distillers on the other. Both users and producers can then focus on exactly what they do best, while skilled Augustus technicians closely monitor and control the delivered product. This ensures users can have the confidence that they will receive the best raw materials suited to their requirements. | |
Email: | Enquiries |
Email: | Sales |
Email: | web site enquiries |
Voice: +44 (0)1420 590555 | |
Fax: +44 (0)1420 592420 | |
Services | |
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Product(s): | |
Indole |
We bring nature to your flavour | |
Dedicated to provide the best possible quality and supply service of natural aroma ingredients. | |
Axxence Aromatic is entirely dedicated to provide the best possible quality and supply service of natural aroma ingredients to the Flavour & Fragrance Industry worldwide. | |
Email: | Service |
Voice: +49.2822.68561.0 | |
Fax: +49.2822.68561.39 | |
Sustainability | |
Products List: | View |
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Product(s): | |
259310 INDOLE Natural Kosher |
From Grams to Tons | |
Fine chemical high-tech company which contains R&D, production, and sales. | |
BEIJING LYS CHEMICALS CO, LTD, established in 2004, is a fine chemical high-tech company which contains R&D, production, and sales. We mainly engaged in export and technology development of flavor and fragrance materials and pharmaceutical intermediates. We have nearly 500 kinds of products, from grams to tons, exported to USA, Europe, South Asia and etc. And we custom manufacture new products according to customers’ needs, and serve good quality products and service. Our goal is to become a fine chemical enterprise which could provide special products and services. | |
Email: | Mr. Jia |
Email: | Mr. Guo |
Voice: 86-10-68418738 | |
Fax: 86-10-68418739 | |
Mr. Guo | 86-10-68483445 |
Mr. Guo | 86-10-68418739 |
News | |
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Product(s): | |
10710 Indole |
Where the world comes to its senses | |
Where the world comes to its senses - Berjé is a global distributor of Essential Oils and Aromatic Chemicals. | |
Berjé is a family-owned business that has been in operation for six decades. The company's origins and strength lie in a profound understanding of the supply and the quality of the diverse raw materials consumed by the flavor and fragrance industries. This base was expanded upon more than two decades ago to include fragrance production. The company's unparalleled raw material expertise is focused on the supply of essential oils and aromatic chemicals. This is supported by our long-standing relationships with a worldwide fabric of producers ensuring the greatest prospects for uninterrupted supply in markets that are often volatile and unpredictable. | |
Email: | For Information |
Email: | For Sales |
Voice: 973-748-8980 | |
Fax: 973-680-9618 | |
Flavor Ingredients | |
Fragrance Ingredients | |
Functional Ingredients | |
Media | |
Products List: | View |
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Product(s): | |
Indole Crystals |
Best of Chemicals Supplier | |
Quality supplier of research chemicals and biochemicals including inhibitors, building blocks, GMP Products, impurities and metabolites, APIs for Veterinary, Natural Compounds, ADCs, Stem Cell Molecule and chiral compounds. | |
BOC Sciences provides a wide range of services to support the pharmaceutical industry through all stages of drug discovery including Custom Synthesis of those chemicals that are not in stock, Isotope Labeling Service, Chiral Synthesis and Resolution, Bioconjugation, PEGylation services, analytical services. | |
BOC Sciences is a brand of BOCSCI Inc. We leverage our wide spectrum of business in the fields of development, manufacturing, marketing, and distribution to help you make best-informed decisions tailored to your evolving needs for premium chemicals. Our complete suite of CRO services spans the entire molecule development pipeline including contract research for target identification, building blocks, compound synthesis, biochemical and cellular analysis, preclinical animal tests, and clinical studies. | |
Email: | Marketing |
US Email: | Marketing |
Email: | Sales |
US Email: | Sales |
Voice: 1-631-485-4226 | |
Fax: 1-631-614-7828 | |
US Voice: 1-631-485-4226 | |
US Fax: 1-631-614-7828 | |
Europe | 44-203-286-1088 |
Blog | |
Get the App! | |
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Product(s): | |
120-72-9 Indole 95% |
Ingredients by Nature | |
Exceptional quality and excellence in meeting our customers requirements. | |
Excellentia International was founded in 2010 through the merger of Excellentia Flavors LLC and Polarome International. Collectively, these companies account for more than one hundred years of industry experience, and are recognized for exceptional quality and excellence in meeting our customers’ requirements. | |
Email: | Info |
Email: | Sales |
Email: | Regulatory |
Voice: 732.749.9840 | |
Our Services | |
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Product(s): | |
Indole Natural |
Preferred Partner | |
Accommodate each customers unique needs. | |
Global Essence was founded in 1993 as a two person operation servicing regional customers in the New York/ New Jersey area. In the twenty years since, it has grown into a multinational operation with offices in the US, UK, and Singapore. These offices allow Global to provide regional support to its customers worldwide. As the world continues become more connected, this approach positions Global to continue to offer the highest quality products and experience to all of its customers. | |
Email: | Info |
US Email: | Info |
Voice: +44 (0) 1279 876666 | |
Fax: +44 (0)1279 876646 | |
US Voice: 001 732 677 1100 | |
US Fax: 001 732 677 1107 | |
Blog | |
Press Release | |
News | |
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Product(s): | |
Indole |
Perfumery and Aromatherapy materials since 1979 | |
Hermitage Oils, the true home of essential oils! | |
Hermitage Oils offers a selection of Absolutes, Essential Oils, Natural Isolates, Aroma Chemicals, CO2 Extracts, Ethanol Tinctures, and Extraits by Enfleurage. | |
Email: | Info |
Email: | Sales |
CODE100651 CODE100651 | |
Product(s): | |
Indole 1% Natural Isolate | |
Eleonora Scalseggi has this to say “Often called “magic” indole is indeed a very fascinating material whose importance in perfumery cannot be overstated. Depending on its concentration it can be terribly repulsive or immensely seductive, featuring in the aroma profile of some of the most bewitching floral scents on earth like jasmines and orange blossoms as well as in excrements. Indole is the seductive weapon devised by the most intoxicating night flowers to attract pollinators – usually moths. Funnily enough traces of indole in the aroma profile of a flower make it irresistible for humans too, capable of transforming a delicate, clean yet insignificant floral scent into a narcotic elixir. |
Commitment to quality | |
Idukern F&F Ingredients is your partner for the fragrance and flavor ingredients. | |
Indukern F&F focuses in particular on the service it offers its clients in terms of quality, speed and direct consultancy with more than 1600 different products in stock ready for prompt shipment: Aromachemicals, Essential Oils and Natural Isolates. | |
Email: | Info |
Email: | Luciana Soares (Brazil) |
Email: | Gabriela Garcia (Mexico) |
Email: | Jorge Eduardo Clavijo (Colombia) |
Voice: +34 93 506 91 00 | |
Fax: +34 93 506 91 95 | |
Services | |
Quality | |
Facilities | |
Products List: | View |
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Product(s): | |
INDOL CRYST. |
A family company dedicated to sales and distribution | |
Flexibility, availability, price and quality. | |
Flexibility, availability, price and quality make LLUCH ESSENCE S.L. one of Europe’s references when it comes to essential oils and aroma chemicals, and it is now well known all around the world. | |
Email: | Info |
Voice: 34 93 379 38 49 | |
Fax: 34 93 370 65 04 | |
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Product(s): | |
INDOLE CRYST. | |
INDOLE NATURAL |
Steady supply & demand | |
Meeting customers increasing demands at home as well as abroad. | |
M&U dedicates itself to the development and production of new products as well as continuously promoting those new products. We’ve maintained a steady supply&demand relationship with a large number of manufacturers at home and abroad. We’ve developed an extensive network and because of our relationships with these manufacturers, we’re able to provide a stable supply of great quality materials. We’re located in China’s largest communications hub, Shanghai and in the U.S. near one of the largest sea ports on the East Coast. The strategic locations of our facilities ensure convenient, prompt and secure delivery of our products to our customers. | |
Email: | Sales |
US Email: | Sales |
Voice: +86-21-32515501 60762991 60762992 | |
Fax: +86-21-32515502 64204960 | |
US Voice: 908-359-9000 | |
US Fax: 908-359-9002 | |
News | |
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Product(s): | |
A0429 INDOLE |
THE CHEMISTRY OF EMOTIONS | |
Innovation and commitment in the name of excellence. | |
After 50 years in business, Moellhausen stands out as one of the world’s leading family-run companies in the industry of flavors and fragrances, raw materials, and specialties. | |
Voice: +39 039.685.6262 | |
Fax: +39 039.685.6263 | |
Youtube | |
A network of knowledge to grow together | |
Sustainability is at the foundation of a | |
Pervasive technology and total control | |
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Product(s): | |
118970 INDOLE | |
118971/8179 INDOLE 10%DPG |
Manufacturer of natural flavor ingredients | |
With over 25 years experience in the flavor and food ingredient industries. | |
Technology Improving Taste | |
Natural Advantage was formed over seventeen years ago to supply the growing demand for natural food and flavor ingredients. We employ a wide range of multi-disciplined scientists who are dedicated to high quality service, customer satisfaction and creating an outstanding value for our clients. | |
Email: | Info |
Email: | Customer service |
Voice: 318-215-1456 | |
Fax: 318-335-1579 | |
Who We Are | |
Technology | |
Riverside Aromatics LTD.is the exclusive distributor for Europe in UK for any non-US based inquiries | |
Products List: | View |
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Product(s): | |
NA2593-10-OH Indole Nat, 10% in OH |
Manufacturer of chemicals and ingredients used in flavors, fragrances, food, beverages and cosmetics | |
Leading the Flavor and Fragrance Industry since 1980. | |
O'Laughlin was established in 1980 by its owner and chief executive Michael O'Laughlin, when he moved to Beijing, China and established a small office. Since then it has grown to be a world class producer of chemicals, with significant production facilities in China, and distribution and sales in all major world markets. | |
Email: | Sales |
US Email: | John Gick |
Voice: (852) 2527-1031 | |
Fax: (852) 2529-0231 | |
US Voice: (973) 376-4600 | |
US Fax: (973) 376-4630 | |
CODE100651 CODE100651 | |
Product(s): | |
772-3027 INDOLE |
Hand-made fragrances | |
Pell Wall maintains a broad palette of ingredients & in order to keep stocks fresh & the options wide we also sell from our own stock. | |
Pell Wall was founded by perfumer Chris Bartlett to provide exclusive hand-made fragrances to a select few people who love them. All our products are created using fine quality ingredients, many of which we also offer for sale to other perfumers and enthusiasts. Pell Wall make fragrances for men, for women and for the home. | |
Email: | Info |
Email: | Sales |
Voice: +44 (0) 20 3745 0887 | |
Blog | |
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Product(s): | |
Indole | |
Arctander writes extensively about this material; here are a couple of extracts: “Extremely diffusive and powerful odor, almost tarry-repulsive and choking when concentrated, but in concentrations lower than 0.1%. or in compositions, it shows powerful floral notes and pleasant radiation. Good tenacity, in spite of the volatility at room temperature.” |
Chemistry innovation | |
At Penta, our products and services help businesses do business better. | |
For over 30 years, Penta Manufacturing Company has played a growing role in worldwide chemistry innovations and applications. As an industry leader, Penta continues to pioneer chemistry-based solutions for practically every area of commerce. Our products and expertise have helped fuel technical advances in dozens of commercial applications including flavoring, coloring, fragrances and chemical processes. | |
US Email: | Technical Services |
US Email: | Sales |
US Voice: (973) 740-2300 | |
US Fax: (973) 740-1839 | |
CODE100651 CODE100651 | |
Product(s): | |
09-01800 INDOLE | |
09-01805 INDOLE NATURAL (NEAT) | |
09-01810 INDOLE NATURAL IN ETHYL ALCOHOL | |
09-01802 INDOLE FCC GRADE |
feeeel... the smell! | |
The one-stop resource for the creative perfumer. | |
No minimum orders. Aroma chemicals, essential oils, isolates, pheremones, absolutes, resinoids, FleuressenceTM key bases, PWx FactorTM, solubilizers, kits, creation systems, workshops, training, distance learning, The PerfumersWorld Perfumer's Studio, The Perfumer’s Formulation Bulletin, perfumery software, bespoke creation, analysis, consultancy, project counselling, trouble-shooting, unperfumed product bases, bottles, smelling strips, scales, distillation, equipment and inspiration! | |
Email: | Enquiries |
Email: | Sales |
Voice: +66(0)2-99-800-80 | |
Fax: +66(0)2-99-800-80 | |
PerfumersWorld | |
Google+ | |
Youtube | |
Resources | |
Software: | Perfumer's Workbook |
CODE100651 CODE100651 | |
Product(s): | |
9UN00235 Indole | |
Blends-well-with - +Phenyl Acetic Acid +Mimosa | |
5UN07558 Indole 10% in DPG |
PRODUCTEUR PAR ESSENCE | |
Chemical specialist in manufacturing, distributing and sourcing of tailor-made ingredients for the Flavour & Fragrance industry. | |
Today we are also proud to say, we have created an important range of Natural Molecules which can be found in our Raw Material Compendium. The versatility of our small but efficient structure is one of our main strengths when trying to fulfill our clients' requirements. | |
Email: | Info: |
Email: | Sales Team Prodasynth |
Voice: (33) 4 93 09 00 11 | |
Fax: (33) 4 22 13 07 38 | |
New Catalog | |
Products List: | View |
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Product(s): | |
INDOLE (> 99%) |
Complete Supply Chain | |
The perfect blend of products and services that bring your creativity to life. | |
Sigma-Aldrich is a leading Life Science and High Technology company dedicated to providing high-quality, safe and certified flavor ingredients with transparent and easily accessible documentation to customers around the globe. Sigma-Aldrich also provides a suite of analytical tools that allow food analysts to simplify sample preparation, cleanup and analysis steps, while increasing sensitivity to trace ingredients and harmful substances to meet regulations and quality standards. | |
Email: | Information |
US Email: | Sales |
US Voice: 800-244-1173 | |
US Fax: 800-368-4661 | |
Flavors and Fragrances Analysis | |
FandF Newsletter Subscription | |
Flavors and Fragrances Learning Center | |
Certified Food Grade Products | |
CODE100651 CODE100651 | |
Product(s): | |
W259306 Indole, ≥99%, FG | |
SDS | |
W259378 Indole, natural, ≥97%, FG | |
SDS |
For over 25 years | |
Bringing flavour and fragrance into your world. | |
As suppliers / distributors of ingredients to the fragrance and flavour industries, our goal is to provide high quality materials at competitive prices with an exceptional level of service. Established in 1984, SRS Aromatics Ltd is an independent family owned business which has become very well-respected within the fragrance and flavour industry as a reliable and trustworthy partner. Over the years this has allowed the company to develop strong relationships with many global manufacturers; several of whom we represent in the UK. A core aim of our business is to work extremely closely with both our suppliers and customers to maximise service levels with minimum disruption to supply. | |
Email: | Info |
Email: | Sales |
Voice: +44 (0) 1284 704076 | |
Fax: +44 (0) 1284 760819 | |
News | |
CODE100651 CODE100651 | |
Product(s): | |
INDOLE |
Moving Your Chemistry Forward | |
We continuously strive to advance our technology. | |
With East & West Coast distribution centers, count on TCI to deliver products quickly and reliably. Over 30,000 Reagents available today in benchtop to bulk quantities. We also offer custom synthesis solutions. Sign up for a TCI account today for fast and free shipping! | |
Tokyo Chemical Industry Co., Ltd. (TCI) is a leading worldwide manufacturer of specialty organic chemicals founded in 1946. TCI provides organic laboratory chemicals as well as pharmaceutical, cosmetic and functional materials. More than 70 years of synthesis experience and multi-purpose plants enable TCI to offer more than 30,000 products as well as custom synthesis. | |
US Email: | Sales |
Email: | Technical Support |
Voice: 1-800-423-8616 | |
Fax: 1- 888-520-1075 | |
CODE100651 CODE100651 | |
Product(s): | |
I0021 Indole >99.0%(GC) | |
SDS |
Suppliers Since 1942 | |
Supplying the fragrance and flavor industry with high quality products. | |
The John D. Walsh Company, Inc. has evolved from its beginnings as an agent/broker into a distributor of essential oils, aroma chemicals, concretes and absolutes. We currently represent the following companies, as their North American distributor: Destilerias Munoz Galvez, S.A. International Flavors & Fragrances PFW Aroma Chemicals B.V. Innospec Widnes Limited Hydrodiffusion de Guatemala, S. A. DSM Nutritional Products The John D. Walsh Company, Inc. is proud to be a founding member of IFEAT, an active member of IFRA, North America, and a corporate sponsor of the WFFC. | |
Email: | Information |
Email: | Sales |
Email: | Firmenich Flavor inquiries |
Voice: 973-962-1400 | |
Fax: 973-962-1557 | |
Firmenich Flavor Phone: | 973-962-1888 |
Firmenich Flavor Fax: | 973-962-1898 |
History | |
CODE100651 CODE100651 | |
Product(s): | |
Indole | |
SDS |
Your Sourcing Resource | |
The Lermond family has been sourcing raw materials for the flavor and fragrance industry for nearly 7 decades. | |
The Lermond Company is a women-owned distributor of raw materials primarily servicing the flavor and fragrance industry. For three generations, members of the Lermond family have been integral sourcing partners for the North American flavor and fragrance industry. We supply high quality essential oils, aroma chemicals, absolutes, concretes, resinoids and floral waters from around the world to the global industry. | |
Email: | Info |
Email: | Tara |
Email: | Erica |
Voice: 201-896-3300 | |
Fax: 201-623-2910 | |
CODE100651 CODE100651 | |
Product(s): | |
30007 INDOLE |
Leaders in essence | |
We employ our five senses to do our job well. | |
Ventos has specialized in the distribution of raw materials for the flavour and fragrance industry. With more than 1700 references permanently available from stock, we offer a just-in-time response to our customer needs, being able to deliver from 1kg to several tonnes all over the world. | |
Email: | Information |
US Email: | Information USA |
Email: | Gemma Parramon (Europe) |
US Email: | Gemma Parramon (Europe) |
Email: | Jorge Sos (Asia) |
Email: | Ramon Rubau (America) |
Voice: +34 934706210 | |
Fax: +34 934733010 | |
US Voice: +1 856 226 7501 | |
Youtube | |
Press Ads | |
Videos | |
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Product(s): | |
INDOLE | |
INDOLE, NATURAL |
Passion for Simplicity | |
Manufacturer and supplier of high quality flavor and fragrance ingredients. | |
The growth and success of Vigon is due in large part to a unique corporate concept that Vigon has developed and established within the industry: Creative Partnerships. This partnership concept has been and continues to be the foundation and guiding principle for all of Vigon's activities. | |
US Email: | Sales |
US Voice: 570-476-6300 | |
US Fax: 570-476-1110 | |
Newsletter | |
Blog | |
Products List: | View |
CODE100651 CODE100651 | |
Product(s): | |
500788 Indole |
Distributor of Speciality Chemicals and Natural Ingredients | |
Sourcing and supplying quality aroma chemicals and prestige natural ingredients for the flavour and fragrance industry. | |
The flavour and fragrance industry's premier source for aroma chemicals and essential oils | |
Zanos Ltd. is a B2B supplier of aroma chemicals, speciality chemicals, natural ingredients and vitamins to a diverse range of customers. In Autumn 2020, Stort Chemicals Limited completed their acquisition of Zanos Ltd. Combining our strengths, Stort and Zanos have boosted our respective portfolios of aroma chemicals, speciality chemicals and natural ingredients. With warehousing facilities across the UK, Rotterdam and Hamburg, Zanos is perfectly positioned to dispatch product throughout Europe. | |
Email: | Contact Zanos |
Email: | Lisa Senior |
Voice: +44 (0) 1565 755899 | |
Fax: +44 (0) 1565 755799 | |
Latest News | |
Products | |
Representation | |
Products List: | View |
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Product(s): | |
Indole |
Category: flavor and fragrance agents
US / EU / FDA / JECFA / FEMA / FLAVIS / Scholar / Patent Information:
Physical Properties:
Organoleptic Properties:
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Suppliers:
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References:
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Potential Blenders and core components note
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Occurrence (nature, food, other):note
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Notes: Constit. of several flower oils, esp. of Jasminum and Citrus spp. (Oleaceae) prod. of bacterial dec. of proteins. Flavouring ingredient. Also present in crispbread, Swiss cheese, Camembert cheese, wine, cocoa, black and green tea, rum, roasted filbert, rice bran, clary sage, raw shrimp and other foodstuffs
Indole is a major constituent of coal-tar, and the 220-260 °C distillation fraction is the main industrial source of the material. Indole and its derivatives can also be synthesized by a variety of methods. The main industrial routes start from aniline.; Indole is a solid at room temperature. Indole can be produced by bacteria as a degradation product of the amino acid tryptophan. It occurs naturally in human feces and has an intense fecal odor. At very low concentrations, however, it has a flowery smell, and is a constituent of many flower scents (such as orange blossoms) and perfumes. It also occurs in coal tar.; Indole is an aromatic heterocyclic organic compound. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring. Indole is a popular component of fragrances and the precursor to many pharmaceuticals. Compounds that contain an indole ring are called indoles. The most famous derivative is the amino acid tryptophan.; Indole is an aromatic heterocyclic organic compound. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring. It can be produced by bacteria as a degradation product of the amino acid tryptophan. It occurs naturally in human feces and has an intense fecal smell. At very low concentrations, however, it has a flowery smell, and is a constituent of many flower scents (such as orange blossoms) and perfumes. Natural jasmine oil, used in the perfume industry, contains around 2.5% of indole. Indole also occurs in coal tar. The participation of the nitrogen lone electron pair in the aromatic ring means that indole is not a base, and it does not behave like a simple amine.; The Leimgruber-Batcho indole synthesis is an efficient method of sythesizing indole and substituted indoles. Originally disclosed in a patent in 1976, this method is high-yielding and can generate substituted indoles. This method is especially popular in the pharmaceutical industry, where many pharmaceutical drugs are made up of specifically substituted indoles.; The name indole is a portmanteau of the words indigo and oleum, since indole was first isolated by treatment of the indigo dye with oleum.
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