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Picric acid or 2-Amino-4,6-dinitrophenol or the Sodium salt and Sodium polysulfide solution heated to 110 ℃, and return, until the sample to dye inspection standard. If necessary, use the empty oxygen precipitation and filter.Properties and Applications
red light black. In the Sodium sulfide solution solubility is very good, for red black; In concentrated sulfuric acid for the blue black, dilution after precipitation.| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Fulling | Persperation Fastness | Soaping | |
| Moderate | Severe | ||||||
| ISO | 5 | 5 | 6-7 | 4-5 | 5 | 4-5 | |
| AATCC | 3 | 3 | 8 | 3 | 5 | ||
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Sulfurized amino nitro phenols
2,5-Cyclohexadien-1-one, 4-[(4-amino-8-hydroxy-1-naphthalenyl)imino]-, reaction products with sodium sulfide (Na2(Sx))
C.I. Sulphur Black 3 (8CI)
Phenol, 4-(9H-carbazol-3-ylamino)-, reaction products with 4-(2-naphthalenylamino)phenol, 4-nitrophenol and sodium sulfide (Na2(Sx)), oxidized
Oxidized sulfurized aminophenols
Sulphur Black 2
C.I. Sulphur Black 4 (8CI)
Phenol, 2,4-dinitro-, reaction products with 4-[(2,4-dinitrophenyl)amino]phenol and sodium sulfide (Na2(Sx))
Sulphur Black 6