| Name | Neutral Violet Bl |
| Synonyms | Violet BL Acid violet 68 Neuter Violet BL Neutral Violet Bl C.I. Acid Violet 68 Youhaoneuter Corinth BL. |
| CAS | 61724-46-7 |
| Molecular Formula | C16H13N3O4S |
| Molar Mass | 343.35 |
| Physical and Chemical Properties | Chemical properties purple to purple-black powder. It is purplish red in concentrated sulfuric acid and purple solution after dilution. It is purplish red in concentrated nitric acid, and precipitation occurs after dilution. There is no change in concentrated hydrochloric acid, and it is red and blue after dilution, with precipitation. There is no change in concentrated sodium hydroxide, and it is purple after dilution. |
| Use | Used for dyeing of wool, silk, tussah silk, vinylon, Wei/cotton, wool/sticky and other blended fabrics |
| Raw Materials | Salicylic acid 3-Amino-4-hydroxybenzenesulphonamide Salicylic acid 3-Amino-4-hydroxybenzenesulphonamide 2-Naphthol |
use
neutral purple BL is mainly used for dyeing wool, silk, nylon and vinylon in neutral or weak acid dyeing bath, as well as direct printing of wool, silk and nylon fabric. When used for dyeing wool and other fibers in the same bath, nylon is darker in color, silk is lighter, and diacetate fiber, cotton and viscose fiber are slightly stained. It can also be used for dyeing leather.
production method
using 2-aminophenol -4-sulfonamide and 2-naphthol as raw materials, first diazotize 2-aminophenol -4-sulfonamide, then couple with 2-naphthol, and finally complexate with sodium chromium salicylate, filter and dry to obtain the finished product (see neutral jujube GRL for the reaction formula).