Direct Dyes
Direct dyes are a type of dye that can directly dye cellulose fibers in a neutral or weakly alkaline medium. Usually, no mordant is needed. Just add salt or sodium sulfate to the dye bath and boil it to dye. It is usually formed by hydrogen bonds and van der Waals forces between cellulose and dyes, so it has poor washing and light fastness. Light fastness above level 5 is called direct light-fast dye.
Direct dyes have a complete color spectrum from yellow to black, simple production process, low price, and easy use. Therefore, they are widely used in knitting, silk, cotton spinning, thread and tape, leather, wool and linen, papermaking and other industries, and are also used for dyeing viscose fibers.
ENGLISH NAME: Direct Blue BRL
C.I. NO.: 51300, Direct Blue 201
CAS NO: 60800-55-7
MOLECULAR FORMULA: C30H16Cl2N4Na2O8S2
MOLECULAR WEIGHT: 741.48
PRODUCT NAME：Direct Yellow GGR
C.I. NO.: 22010，Direct Yellow 24
MOLECULAR FORMULA: C25H17N5NA2O6S
MOLECULAR WEIGHT:561.48
Direct dyes are dyes that can be heated and boiled in neutral and weakly bonded media without the help of a mordant. Direct dyes are mainly used in fiber, silk, cotton spinning, leather and other industries, but also in papermaking and other industries.
ENGLISH NAME: Direct Yellow R,Sunyellow
C.I. NO.:40000,Direct Yellow 11
CAS NO:1325-37-7
MOLECULAR FORMULA:C16H10N2Na2O7S2
MOLECULAR WEIGHT:712.6626
ENGLISH NAME: Chrysophenine G,Direct Yellow G
C.I. NO.:24895,Direct Yellow 12
CAS NO:2870-32-8
MOLECULAR FORMULA:C30H26N4Na2O8S2
MOLECULAR WEIGHT:680.659
ENGLISH NAME: Direct Red BWS
C.I. NO.:29315,Direct Red 243
CAS NO:86543-85-3
MOLECULAR FORMULA:C38H28N10Na4O17S4
MOLECULAR WEIGHT:1116.89