| Name | Neutral Blue Bnl |
| Synonyms | Blue BNL AcidBlueBNL Acid Blue 168 Neutral yan LAN C.I.AcidBlue168 NEUTER BLUE BNL Neutral Blue BNL Neutral Blue Bnl Neutral deep blue C.I. Acid Blue 168 |
| CAS | 12219-24-8 |
| Molecular Formula | C20H15CuN5O5S |
| Molar Mass | 500.97 |
| Physical and Chemical Properties | Blue to blue-gray powder. In concentrated sulfuric acid was red, diluted light orange. Destroyed in concentrated nitric acid. No change in sodium hydroxide, diluted light red blue solution. No change in concentrated hydrochloric acid, diluted light red blue, and precipitation. The aqueous solution was blue in color. |
| Use | neutral blue BNL is mainly used for dyeing wool and silk in neutral or weak acid dyeing bath, and wool, silk, direct printing of nylon fabric. When it is used for dyeing wool with various fibers in the same bath, the color of nylon is darker, the silk is slightly lighter, the diacetate fiber is stained, the cotton is slightly stained, and the viscose fiber and polyester are not stained. Can also be mixed with neutral dark yellow GL neutral green GL. used for dyeing wool, silk, tussah silk, nylon, Vinylon and other fabrics |
| production method | 2-aminophenol -4-sulfonamide and O-carboxydiphenylhydrazone are used as raw materials, first, 2-aminophenol -4-sulfonamide was diazotized, then coupled with O-carboxy diphenylhydrazone, and finally complexed with copper sulfate, filtered and dried to obtain a finished product.. |