Indigo CAS# 482-89-3

Indigo, Promotion Season Now in Store and Free Sample for Testing with Factory Price
  • Assay: 98%min
  • Appearance: blue powder
  • Package: 25kg/bag
  • Sample: Available

Quality Control of Indigo

Chemical Structure
Packing of Bretazenil

Description of Indigo

Indigo dye is an organic compound with a distinctive blue color (see indigo). Historically, indigo was a natural dye extracted from plants, and this process was important economically because blue dyes were once rare. A large percentage of indigo dye produced today – several thousand tons each year – is synthetic. It is the blue often associated with blue jeans.

Basic Info of Bretazenil

Basic Info

Chemical Name



indigo powder;Indigo J;AO201;indigon;Indigotin;Expand



Molecular Formula


Molecular Weight







Safety Info



Safety Statements


HS Code


WGK Germany



UN 3264 8/PG 3

Risk Statements


Hazard Codes




Appearance & Physical State

Dark blue powder (or granule)



Boiling Point

400.4ºC at 760mmHg

Melting Point

390-392ºC (dec.)

Flash Point


Refractive Index



Stable. Incompatible with strong oxidizing agents.

Storage Condition

Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances.

Vapor Pressure

1.27E-06mmHg at 25°C


Numbering system

MDL number



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What is Indigo?

Part I: Introduction

With the development of technology and social progress, machinery, medicine, cosmetics, electronics, industry, and so on are all penetrating people’s daily life. One of these products is indigo, which is developing particularly rapidly. Do you know indigo?

The official answer: indigo, with the molecular formula C16H10N2O2, is a water-soluble, non-azo colorant. Indigo pigments are among the oldest pigments known to man and are widely used in the food, pharmaceutical, and dyeing industries.

How does indigo work?

Part 2: Expanding in depth

Indigo leaves are piled up and watered regularly so that they ferment for 2 to 3 months and become black and clay-like. When pounded with a mortar it is called ball indigo and contains 2% to 10% indigo blue pigment. The ball indigo is mixed with wood ash, lime, and bran, then mixed with water, heated to 30-40°C, and exposed to the air to become blue insoluble indigo.

Mainly used for dyeing cotton yarn, cotton cloth, wool, or silk, the pigment is an important product for the pigmentation of the reduction dye indigo, with excellent light and weather fastness and heat stability, giving a blue tint, and can be prepared in liquid dispersion dosage form, mainly used for coloring and printing of viscose fiber stock. It is used as a biochemical agent and indicator as well as dyeing of cotton yarn, cotton cloth, wool or silk, etc.

Used as a food colouring agent, China’s regulations can be used in red and green silk, the maximum use of 0.02g/kg; in juice (taste) drinks, carbonated beverages, prepared wine, candy, pastries on the colored, dyed cherry cans (for decoration), plum, the maximum use of 0.10g/kg; in the maximum use of 0.01g/kg in dipping vegetables.

Part III: Summary

Sincere to the customer and in good faith of quality is our forever followed motto. It’s the basement to be a human and do business. We take all responsibility for our products and service sincerely. We are a company integrating R&D, production, and sales. The design, research, and development of pharmaceutical intermediates including more than 330 kinds of pharmaceutical intermediates such as Anti-infectives, Cardiovascular and Cerebrovascular Systems, Digestive System, Santi-tumor, Nervous System, Geriatric Drugs, and Gynecological Drugs. At the same time, we have more than 4,000 factories in strategic cooperation with nearly 50,000 chemical products, so we can provide you with a one-stop purchasing service, which greatly saves customers’ procurement costs and time.


Sincere Chemical has been dedicated to the research and development of antidepressants and the reform of production processes for more than ten years and has achieved a number of continuous, large-scale, and intelligent manufacturing technologies for antidepressants and related fine chemicals with independent intellectual property rights.

With more than 10 automated production plants, the company produces hundreds of products in a wide range of industries, including more than 330 kinds of pharmaceutical intermediates such as Anti-infectives, Cardiovascular and Cerebrovascular Systems, Digestive systems, Santi-tumor, Nervous systems, Geriatric Drugs, and Gynecological Drugs. We welcome inquiries about our products and technical knowledge of bretazenil.

Hello, I’m Pew Ni, the chemical products one-stop solution expert.

Hi, I‘m Peter Ni, the founder of Sincere-Chem, I’ve been running a company in China that exporting chemicals, pharmaceuticals, and intermediates for over 70 countries now. And a range of 50,000 products with the best quality and competitive price to meet your different purchasing needs.

CEO Email:

CEO Phone Number:
+86-188-6575 9396

CEO WhatsApp:
+86-188-6575 9396

Request A Free Quote

Keywords of Indigo

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United Kingdom Giles
United Kingdom Giles
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Peter has been my partner for many years, we met at the Shanghai CPHI Fair in 2014, for the first time I didn't have much interest in Peter's products because our company had a stable supplier. Although we didn't work together, Peter would often send me important news and interesting trend information about the industry, so we became good friends, even though I didn't place any orders with him during this time, even if it was a sample order. In September 2016, our original supplier was unable to provide us with the quality and delivery guarantees we needed, so I first thought of Peter and his company. Until now, we have maintained a very good personal friendship in addition to a steady business relationship.
India Shikhar
India Shikhar
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In all my years of sourcing from China, I first time to found that working with Sincere Chemical was so good, they helped me with all the production and delivery as well as a lot of technical expertise, which saved me a lot of time. When I first approached Peter for a quotation for Optical Brightener, he made me a detailed quotation with not only prices but also foreign trade details, company profile, company strengths, R&D capabilities, production capacity, packaging methods, raw material control, environmental protection, and much more. This information was a very important reference for me in making purchasing decisions. Sincere Chemical is a trustworthy supplier and I believe our business will grow from strength to strength!
Korea Kim
Korea Kim
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Hi, I'm Kim, I'm Peter's partner and although I don't like him very much (because he never gives me more money for my prices, hahaha) I'm still willing to write him customer feedback. As an international buyer, I have to deal with a lot of things every day and my inbox is often full of development letters. It's a lot of junk and meaningless pleasantries, which I don't like that much, but Peter's emails always give me a better understanding of the product and the industry. I am also very pleased with his work ethic, and I am very happy with his work every time I work with him, not only in providing quotations but also in facilitating all the details of my work so that I can concentrate more on other things, so he is the best supplier for me. Although his prices are not the lowest among all suppliers, his products give me the greatest peace of mind.
USA Franklin
USA Franklin
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Sincere Chemical team visited our USA factory in the year of 2017. We think highly of cooperation with them. We thanked you for the past excellent orders and best product quality. We also talked about some new products for future orders. We will be still in strategic cooperation in the future and help each other.
Canada Kate
Canada Kate
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I just got the product. The quality is awesome. I’m very happy. Hope to place soon a new order in your company. Also wish for our future business.
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Sincere Chemical is a reliable and professional company. Not only on exporting but also their professional team service. Their team gave us so many suggestions for our new project. We are really satisfied with their awesome service and best product quality. Sincere-Chem’s vendor code is 51465768 in our cooperated vendor list system.
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I have visited Sincere Chemical company in the year 2018. Their company can be considered as one of the most professional, customer-focused, and product quality-driven companies that I have worked with in recent years.
Brazil Aline
Brazil Aline
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We are a pharmaceutical products manufacturer in Brazil. I’m happy to cooperate with Sincere Chemical especially cooperate with Peter. Peter is patient and friendly. I’m satisfied with his 24*7 hours service. We are not only cooperators but also best friends with each other.
Mexico Gonzalo
Mexico Gonzalo
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Great service and very supportive. This is my first order and I feel fortunate to be with Peter and his company. Product received was the right good quality product, so my review is more related with the quality, service and shipment. Thank you for sending. next time I will order again. Good supplier...