Supply CAS No. 209-358-4 Biological Stain Congo Red

Product Name :Congo Red

Appearance: red powder

MF: C32H22N6Na2O6S2

MW: 696.68

EC number :209-358-4

Congo red, chemical name: diphenyl-4,4'-bis(azo-2-)-1-aminonaphthalene-4-sulfonic acid sodium, the molecular formula is C32H22N6Na2O6S2, which is a brown-red powder, soluble in water and yellow Red, soluble in alcohol and orange. Used as an acid-base indicator, the color change range is 3.5 to 5.2, the alkali state is red, and the acid state is blue-violet. Also used to diagnose amyloid lesions.

1.Acid-base indicator, pH 3.0 (blue-violet) ~ 5.0 (red); detection of hydrochloric acid and paper acidity in gastric juice; determination of boric acid, cyanide; biological media additives; biological staining, such as embryonic sections, plant mucin, fiber Coloring, elastic tissue, etc.

2.It has been widely used in the dyeing of cotton and viscose, because it is easily converted into blue due to acid, and there is no proper treatment to improve its wet handling fastness.

3.Since its inception, the amount of this product used in dyeing has been reduced, but it is quite large in the paper industry. It can also be used as an acid-base indicator, Congo red test paper, pH 3.0 (blue-violet)-5.0 (red).

4.Also used for biological staining, analytical reagents.

Xi'an Julong Bio-Tech Co., Ltd. is located in Xi'an City, Shaanxi Province, China. It is a biotechnology enterprise engaged in the research, development, production and sales of animal and plant extracts, cosmetics, pharmaceutical raw materials and intermediates. The company has complete experimental facilities. And advanced testing instruments ensure the stability of product quality from all aspects. The company has a complete sales service system, the products are exported to countries all over the world, and have won a good international reputation with excellent quality and excellent service.
The company has been adhering to the basic principles of "integrity, quality, service, and win-win" to serve customers, constantly strict requirements, set goals, and implement win-win development

Q1: Can i get some samples?

A: Yes, we can supply the free sample, but the shipping cost be paid by our customers.

Q2: How to start orders or make payments?

A: Proforma invoice will be sent first after confirmation of order, enclosed our bank information. Payment by T/T, or Paypal or Escrow(Alibaba).

Q3: How to confirm the Product Quality before placing orders?

A:You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

Q4:What's your MOQ?

A:Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Q5: How about delivery leadtime?

A:Delivery lead time: About 3-5 days after payment confirmed. (Chinese holiday not included)

Q6:Is there a discount?

A:Different quantity has different discount.

Q7: How do you treat quality complaint?

A:First of all, our quality control will reduce the quality problem to near zero. If there is a real quality problem caused by us, we will send you free goods for replacement or refund your loss

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