Nomenclature of dyes:

Certain letters appear after the words indicative of the color of the dye. These represent the tone of the dye and also the intensity of the tone. This G indicates GELB= yellowish tone, R indicates ROT= reddish tone, and B indicates BLEU=bluish tone. Alkali fast Green 3B is a green acid dye with considerable bluish tone. (This is indicated by the suffix 3B.)

In case of Vat dyes the names would appear as Indanthrene Yellow RK, here R indicates ROT= reddish tone and K indicates that the dye is of IK class. If the letter N appears instead of K then it indicates that the dye is of IN class.


In case of reactive dyes the letter C indicates that the dye is cold brand dye. H indicates the dyes are hot brand dye.

Suffix or addition	Meaning	Example	Class of the dye (if specific)
G, R, B	Gelb=yellowish, Rot=reddish, Bleu=bluish tone indication	Cloth red G, red dye with yellowish tint	------
2G, 3G etc	Indicates the increasing tone	Indanthrene yellow 4GK, and IY 5GK	------
L	Indicates that the dye is fast to light	Basacryl yellow 7GL	------
C, H	Cold brand dye, Hot brand dye	Premative C, Procion H	Reactive dyes
HE ME etc	High exhaustion, medium exhaustion etc		Reactive
HE ME etc	High energy etc		Disperse