DIRECT DYES
Sr.No.	Shades		DYCROPULP	C.I.NAME	C.I.NO.	CAS NO.
1			PAPER YELLOW T	DIRECT YELLOW 11	40000
2			ORANGE SE	DIRECT ORANGE 26	29150	3626-36-6
3				DIRECT ORANGE 15
4			ORANGE WS	DIRECT ORANGE 102	29156
5			FAST SCARLET 4BS	DIRECT RED 23	29160	3441-14-3
6			RED 5BL	DIRECT RED 81	28160
7			RED CAS-N	DIRECT RED 239
8			PINK 3B (SF)	DIRECT RED 254
9				DIRECT RED 6	27130
10				DIRECT RED 236
11			VIOLET MB	DIRECT VIOLET 9	27885
12			VIOLET BB	DIRECT VIOLET 35	27915
13			SKY BLUE FF	DIRECT BLUE 15	24400
14			T. BLUE SBL	DIRECT BLUE 86	74180
15			TURQUOISE FB	DIRECT BLUE 199	74190
16				DIRECT BLUE AC
17			BLUE 2R	DIRECT BLUE 290	--
17			BLACK VB	DIRECT BLACK 19	35255
18			BLACK B 7	DIRECT BLACK 155
19			BLACK AR	DIRECT BLACK 168
ACID DYES
Sr. No.	Shades		DYCROPULP	C.I.NAME	C.I.NO.	CAS NO.
1			CYANINE BLUE R	ACID BLUE 92	13390	3861-73-2
2			GREEN PXE	ACID GREEN 1	10020	19381-50-1
3			GREEN N	ACID GREEN 20	20495	5850-39-5
4			DYEGOSOL PINK IR	ACID RED 1	18050	3734-67-6
5			FAST RED A	ACID RED 88	15620	1658-56-6
6			Red B2G	ACID RED 97	22890	10169-2-5
7			RED 3BN	ACID RED 131		12234-99-0
8			VIOLET M4R	ACID VIOLET 12	18075
9			ORANGE 2GL	ACID ORANGE 10	16230
10			Brown R	ACID ORANGE 51	26550
11			METANIL YELLOW R	ACID YELLOW 36	13065	587-98-4
Basic Dyes
Sr. No. SHADES NAME OF THE ITEM C.I.NAME C.I.NO. CAS NO. 1 AUROMINE O CONC BASIC YELLOW 2 41000   2 CRYSODINE Y & R BASIC ORANGE 2 11270   3 METHELENE BLUE PDR WITH ZINC & ZINC FREE BASIC BLUE 9 52015   4 BISMARK BROWN Y & R BASIC BROWN 4 21010   5 MELCHITE GREEN XLS/PDR LIQUID BASIC GREEN 4 42000   6 METHEYL VIOLET CSTL/PDR D BASIC VIOLET 1 42535   7 CRYSTAL VIOLET CSTL/PDR LIQUID BASIC VIOLET 3 42555   8 ETHYEL VIOLET CSTL/PDR LIQUID BASIC VIOLET 4 42600   9 RHODAMINE B 550% BASIC VIOLET 10 45170

Basic dye is a stain that is cationic (+ ve charged) and so will react with material that is (-ve) negatively charged. The cytoplasm of all bacterial cells have a slight negative charge when grown in a medium of near neutral pH and will therefore attract and bind with basic dyes. Some examples of basic dyes are crystal violet, safranin, basic fuchsin and methylene blue. It’s applied to wool, silk, cotton and modified acrylic fibres. Usually acetic acid is added to the dyebath to help the take up of the dye onto the fibre. Basic dyes are also used in the coloration of paper.

Basic dye is a class of dyes, usually synthetic, that act as bases, and which are actually aniline dyes. Their color base is not water soluble but can be made so by converting the base into a salt. The basic dyes, while possessing great tinctorial strength and brightness, are not generally light-fast; therefore their use in the dyeing of archival materials is largely restricted to those materials not requiring this characteristic. Basic dyes were at one time used extensively in dyeing leather, mainly because they are capable of combining directly with vegetable-tanned leather without the use of a mordant. Basic dyes show virtually no migration in acrylic fibers under normal dyeing conditions, compatibility is of major importance in selecting dye combinations with optimum level dyeing behavior.

Basic dyes possess cationic functional groups such as -NR3+ or =NR2+. The name 'basic dye' refers to when these dyes were still used to dye wool in an alkaline bath. Protein in basic conditions develops a negative charge as the -COOH groups are deprotonated to give -COO-. In an electric field the chromophore ion travels to the cathode or negative pole; it is positively charged. Generally forms salts with negatively charged (acidic) substances in tissue (chromatin, ergastoplasm, cartilage matrix, some granules). Affinity for such dyes, is called basophilia. Basic dyes perform poorly on natural fibres, but work very well on acrylics.

The most common anionic group attached to acrylic polymers is the sulphonate group, -SO3-, closely followed by the carboxylate group, -CO2-. These are either introduced as a result of co-polymerisation, or as the residues of anionic polymerisation inhibitors. It is this anionic property which makes acrylics suitable for dyeing with cationic dyes, since there will be a strong ionic interaction between dye and polymer (in effect, the opposite of the acid dye-protein fibre interaction).