Methylene Blue CAS# 61-73-4

Methylene Blue, Promotion Season Now in Store and Free Sample for Testing with Factory Price
  • Appearance: Brown powder
  • Assay: 100. 00%
  • Packaging: 25kg/drum
  • Sample: Available

Quality Control of Methylene Blue

Chemical Structure
Methylene Blue CAS# 61-73-4
Packing of Methylene Blue

Basic Info of Methylene Blue

Basic Info

Chemical Name

methylene blue


Phenothiazin-5-ium, 3,7-bis(dimethylamino)-, chloride;SWISS BLUE;Evan’s Blue;Chromosmon;CI BASIC BLUE 9;Expand



Molecular Formula


Molecular Weight






Numbering system



Safety Statements


HS Code


WGK Germany



UN 1993 3/PG 3

Risk Statements

R22; R41

Hazard Codes



Appearance & Physical State

green fine crystalline powder



Melting Point

190ºC (dec.)(lit.)

Flash Point


Storage Condition

Store at RT


Numbering system




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What is Methylene Blue?

With the progress of science and technology and the development of society, chemical products have invariably permeated our daily lives, in medicine, food, cosmetics, electronics, industry, and other areas, becoming an essential part of our lives. One such product is Methylene Blue which has developed particularly rapidly in recent years. Do you know about Methylene Blue?


The official answer: Methylene blue (MB) is a reducing agent, easily soluble in water, easily crosses cell membranes, is relatively non-toxic, and is approved for clinical use. Since its introduction into biology in the 19th century, methylene blue has been widely used: methylene blue is used as a dye in neuroanatomy and bacteriology; in biochemical studies, methylene blue acts as an indicator of redox. As an antidote, methylene orchid is used to treat methemoglobinemia caused by nitrite and another poisoning; meanwhile, methylene orchid is also used to treat cyanide poisoning and isocyclophosphamide-induced encephalopathy.

What’s the application of Methylene Blue?

Alkaline Lake Blue BB is mainly used for dyeing cotton, acrylic, hemp, and silk, with the poor fastness and sunlight fastness of 2-3 levels. It is also used for paper dyeing, bamboo, and wood coloring, as well as manufacturing ink and color precipitation, and can also be used for dyeing biological bacterial tissues. It can be used for dyeing hemp, silk fabrics, paper, and coloring bamboo and wood. It can also be used in the manufacture of ink and color deposits and in the dyeing of biological and bacterial tissues. It can be mixed with alkaline violet 5BN and yellow dextrin in the ratio of 78:13:9 to form alkaline magenta blue. It is a non-toxic dye, blue in oxidized form and colorless in reduced form. When staining yeast living cells, due to the metabolism of the cells, the cells have a strong reducing ability, which can make the blue oxidized type of magenta blue into a colorless reduced type, while for the weak metabolism or dead cells, there is no such reducing ability or the reducing ability is very weak, and the magenta blue is stained blue or light blue. This method can be used not only to observe yeast cell morphology but also to identify dead cells and living cells of yeast.

Production Method:

  1. N, N-dimethylaniline is nitrosated and reduced to produce p-aminodimethylaniline, then oxidized, sulfated, and condensed with sodium dichromate and thiosulfate, then salted with zinc chloride, salting, filtering, and drying to obtain the finished product. Raw material consumption (kg/t) N, N-dimethylaniline 790 sodium nitrite 250 sulfuric acid 760 hydrochloric acid (31%) 500 sodium dichromate (95%) 1400 sodium thiosulfate 830 refined aluminum sulfate 1060 copper sulfate 52 zinc chloride 372 iron powder 650
  2. N, N-dimethylaniline as the main raw material, first by nitrosation, reduction to get p-aminodimethylaniline, then by Na2Cr2O7.Na2S2O3 oxidation, sulfide, condensation to get thiazine, and finally ZnCl2 into salt, after salt analysis, filtration, drying to get the finished product.


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.

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.

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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...