Product name:Basic Red 2
CAS:477-73-6
Molecular Formula:C20H19ClN4
Formula Weight:350.84
Specification:25g
Chemical property:dark red powder
Use:Used as redox indicator,acid-base indicator and biological stain.
Storage:In ventilate,cool and dry places.
Description:Basic Red 2 is Red in solution in water and Red in solution in ethanol. It is green in concentrated sulfuric acid, blue in dilution and turns red. Adding sodium hydroxide in its aqueous solution to produce brownish red precipitation, adding hydrochloric acid to show blue purple.
Basic Red 2 is made from 2, 5-diaminotoluene, o-toluidine and aniline. First, equal moles of 2, 5-diaminotoluene are oxidized with o-toluidine. Then, it is condensed with aniline.
Basic Red 2 is mainly used for paper coloring and preparation of colored lake organic pigments. It can also be used for dyeing acrylic fiber, hemp and silk as well as coloring bamboo and wood products.