SR.No.	SHADES	DYCROACID	C. I. NAME	C. I. NO.	CAS NO.
1		YELLOW 2GL	ACID YELLOW 17	18965	6539-98-4
2		TATRAZINE Y	ACID YELLOW 23	19140	1934-21-0
3		METANIL YELLOW R	ACID YELLOW 36	13065	587-98-4
4		YELLOW FG	ACID YELLOW 42	22910	6375-55-9
5		YELLOW 5GN	ACID YELLOW 110	--	12220-74-5
6		YELLOW 2GL	ACID YELLOW 151	13906	12715-61-6
7		YELLOW M5RL	ACID YELLOW 204	--	61814-53-7
8		ORANGE GTL	ACID ORANGE 3	10385	6373-74-6
9		ORANGE II	ACID ORANGE 7	15510	633-96-5
10		ORANGE 2GL	ACID ORANGE 10	16230	1936-15-8
11		ORANGE 3GL	ACID ORANGE 56	22895	6470-20-8
12		ORANGE G	ACID ORANGE 74	18745	10127-27-2
13		ORANGE RL	ACID ORANGE 86	--	12220-07-4
14		ORANGE 2G	ACID ORANGE 116	--	12220-10-9
15		ORANGE MRL	ACID ORANGE 142	--	61901-39-1
16		RED 2GN	ACID RED 1	18050	3734-67-6
17		CRYSTA RED A	ACID RED 14	14720	3567-69-9
18		SCARLET 3R	ACID RED 18	16255	2611-82-7
19		RHODAMINE B	ACID RED 52	45100	3520-42-1
20		H/CONC.	AICD RED 57	17053	70865-30-4
21		SCARLET MOO	ACID RED 73	27290	5413-75-2
22		FAST RED A	ACID RED 88	15620	1658-56-6
23		RED B2G	ACID RED 97	22890	10169-02-5
24		RED 106	ACID RED 106	18110	6844-74-2
25		RED RS	ACID RED 114	23635	6459-94-5
26		MAROON V 150%	ACID RED 119	--	12220-20-1
27		RED 3RB	ACID RED 128	24125	6548-30-7
28		RED 3BN	ACID RED 131	--	12234-99-0
29		RED FR	ACID RED 151	26900	6406-56-0
30		RED M2BN	ACID RED 249	18134	6416-66-6
31		RED M3R	ACID RED 362	--	61814-58-2
32		GERANINE 6B	ACID VIOLET 7	18055	4321-69-1
33		VIOLET 4BN	ACID VIOLET 17	42650	4129-84-4
34		VIOLET 4SB	ACID VIOLET 49	42640	1694-09-3
35		RED 10B	ACID VIOLET 54	--	11097-74-8
36		VIOLET MBL	ACID VIOLET 92	--	--
37		MAROON V	ACID VIOLET 119	--	--
38		PATENT BLUE VS	ACID BLUE 1	42045	116-95-0
39		PATENT BLUE AS D/CONC	ACID BLUE 7	42080	3486-30-4
40		NAVY BLUE M3R	ACID BLUE 9	42080	3486-30-4
41		BLUE D/CONC.	ACID BLUE 15	42645	5863-46-7
42		BLUE AG / CRUDE	ACID BLUE 25	15025	6408-78-2
43		BLUE 2G	ACID BLUE 40	15040	6424-85-7
44		BLUE GF	ACID BLUE 90	26360	6104-58-1
45		CYANINE BLUE R	ACID BLUE 92	13900	3861-73-2
46		CYANINE BLUE 5R	ACID BLUE 113	26360	3351-05-1
47		GREEN PXE	ACID GREEN 1	10020	19381-50-1
48		FAST GREEN B	ACID GREEN 9	42100	4857-81-2
49		GREEN V 333 %	ACID GREEN 16	44025	3087-16-9
50		GREEN N	ACID GREEN 20	20495	5850-39-5
51		DARK GREEN N	ACID GREEN 68.1	--	61901-32-4
52		OLIVE MBGL	ACID GREEN 104	--	--
53		OLIVE LSB	ACID GREEN 111	--	--
54		BROWN RD	ACID BROWN 14	20195	5850-16-8
55		BROWN 5	ACID BROWN 67	--	--
56		BROWN NR	ACID BROWN 75	34905	8011-86-7
57		BROWN 6GG	ACID BROWN 83	20250	6408-03-3
58		BROWN MFR	ACID BROWN 97	--	--
59		BROWN HEDG	ACID BROWN 100	--	--
60		BROWN SLR	ACID BROWN 106	--	--
61		BROWN H	ACID BROWN 121	33520	6487-04-3
62		BROWN GB	ACID BROWN 161	--	--
63		BROWN NT	ACID BROWN 165	--	12220-07-4
64		BROWN RD	ACID BROWN 191	--	--
65		BROWN SGR	ACID BROWN 282	--	12219-65-7
66		BROWN 5R	ACID BROWN 348	--	72827-72-6
67		BROWN 5G	ACID BROWN 349	--	72827-73-7
68		BROWN GS	ACID BROWN 425	--	--
69		BROWN MX	ACID BROWN 432	--	--
70		BLACK 10BX	ACID BLACK 1	20470	1064-48-8
71		NIGROSINE BLACK CRYSTAL	ACID BLACK 2	50420	8005-03-6
72		BLACK BR	ACID BLACK 24	26370	3071-73-6
73		BLACK 58	ACID BLACK 58	--	--
74		BLACK NTR	ACID BLACK 210	--	99576-15-5
75		BLACK NB	ACID BLACK 234	30027	157577-99-6
76		BLACK FB	ACID BLACK 235	--	--

Acid dyes are water soluble anionic dyes which are applied to fibres such as silk, wool, nylon & modified acrylic fibres from neutral to acid dyebaths. Attachment to the fibre is attributed, at least partly, to salt formation between anionic groups in the dyes and cationic groups in the fibre. Acid dyes are not substantive to cellulosic fibres. Acid dyes are used both commercially and by the studio dyer to dye protein/animal fibers such as wool, silk, mohair, angora, alpaca and some nylons and synthetics. Acid dyes require the use of an acid such as vinegar, acetic or sulphuric acid to set the color.

Acid dyes sound scary to some novices, who imaging that the dyes themselves are caustic strong acids. In fact, the dyes are non-caustic, are in many cases non-toxic, and are named for the mild acid (such as vinegar) used in the dyeing process, and for the types of bonds they form to the fiber. Some of them are significantly more toxic than fiber reactive dyes, while others are even safe enough to eat, and are sold as food coloring.

Acid dyes are classified into several classes: 1, leveling acid or strong acid dye, 2, super milling or fast acid or neutral acid dyes 3, milling or weak acid dyes, and. Leveling Acid Dyes are been sold under the trade names of Kiton, Erio, Intracid, Sandolan, and Amacid, among others; they are also the acid dye component of all-purpose or union dyes such as Rit and Tintex, says Knutson. It's difficult now to find out which specific acid dyes fall into which of these dye classes, however. At least part of the reason is that the information is not particularly useful to the dyer.

Most histologic dyes are distinguished as acid or as basic dyes. An acid dye exists as an anion (negatively charged) in solution, while a basic dye exists as a cation (positive charge). For instance, in the hematoxylin-eosin stain (H&E), the hematoxylin-metal complex acts as a basic dye. The eosin acts as an acid dye. A very large class of dyes containing acidic groups, such as the sodium salts of sulfonic acids or phenolic groups. They are more soluble and have less tinctorial value than basic dyes but they also have greater light fastness. They do not form lakes with tannin. Acid dyes are used in dyeing leather, paper, etc., and their particular value lies in their ability to produce brighter, more uniform colors. They are normally applied from an acid dye liquor (acetic, formic, or sulfuric acid); however, unless applied from a neutral or only slightly acid dyebath, i.e., pH of 6.0 to 7.0, their use is likely to result in acid degradation of the material dyed.