Dye of paper congo red papers congo red strips

Product introduction

Congo red test paper is made from Congo red solution. Congo red dates red powder, can dissolve in water and alcohol, slightly soluble in acetone, almost insoluble in ethyl ether, acid was blue. Not only can it be used as a dye, but also as an indicator. Congo red is an acid indicator, the color change range is from 3.5 to 5.2, the base state is red, and the acid state is blue and purple. Some people think that Congo big red bayberries, is actually wrong. Congo red can be done as a pharmaceutical ingredient.
0.5g Congo red dissolved in 1L water, add 5 drops of acetic acid, filter paper in the warm solution after dipping out to dry. Organic acids such as formic acid, acetic acid and oxalic acid also make it blue.

Company introduction：

Aoke Biological Engineering （Yangzhou）Co.,Ltd, established in 2,011, is a professional manufacturer engaged in the research, development, production, sale and service of PH test papers,PH special test papers, Qualitative filter papers,Quantitative filter papers,Chemical analysis test papers.Until now,our products have been widely used in scientific search,industry,agriculture,medicine and health,universities and environmental testing. We are located in Yangzhou City,Jiangsu Province with convenient transportation access. Dedicated to strict quality control and thoughtful customer service, our experienced staff members are always available to discuss your requirements and ensure full customer satisfaction. In recent years, our company has introduced a series of advanced equipment including Paper cutter, Binding machine, Punch machine and Rolling cutting machine. Anyway,we aim to establish and generalize our own brand.We all hope that we can bring our products to the world one day. Now,selling well in all cities and provinces around China, our products are also exported to clients in such countries and regions as France,USA,UK,HK,Switzerland. We also welcome OEM and ODM orders. Whether selecting a current product from our catalog or seeking engineering assistance for your application, you can talk to our customer service center about your sourcing requirements.We will try to meet your needs.We truly welcome customers from all parts of the world seek cooperation for mutual benefits.If necessary, please contact us in time ,Thanks.