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The Ultimate Chemistry of Color
 
  Acid Dyes  
 
Properties | Shade Card | Dyeing Procedure
Properties:
ACID DYES are the selected range of dyestutfs suitable for dyeing on pure wool. The various dyes in the shade card have been grouped mainly according to their exhaustion behaviour, colour fastness and other characteristics on wool. The following are the main groups:
a)

ACID LEVELLING & TPM DYES

The levelling dyes of this group require strongly acid dyebaths employing Sulphuric or Formic acids. The pH of the dyebath is around 2.5-3. The dyes are generally bright with good levelling properties but have moderate wet fastness. The fastness to light varies from moderate to excellent.

The Milling & TPM dyestuffs are dyed in a weakly acid or neutral bath employing a pH around 4-4.5. Acetic acid or Acid liberating salt such as Ammonium sulphate or Acetate are used. The shades obtained are bright with good all round colour fastness properties.

b)

ACID 1:1 METAL COMPLEX DYES

This group comprises premetallised 1:1 Metal Complex Acid Dyes.

These dyes have excellent level dyeing properties and all round good colour fastness. In view of their outstanding levelling properties, the dyes are eminently suitable for the production of even very pale shades with good colour fastness.

c) ACID 1:2 METAL COMPLEX DYES

These dyestutfs are dyed in a neutral or slightly acidic bath employing a pH around 5-7. The dyestuffs have a good degree of penetration, therefore, particularly suitable for the dyeing tightly woven goods. Also shades obtained have good all round fastness properties.

Shade Card:
  0.5%                2%
ACID Dyes
C.I. No.
Light
Washing
Milling
Perspi-
ration
Dischar-
geability
Yellow 2G
Yellow 17		 18965 4-5 4-5 3-4 3-4 3-4
Tartarzine
Yellow 23		 19140 3 4-5 5 3-4 5
Metanil Yellow R
Yellow 36		 13065 2 4-5 4 2 5
Milling Fast Yellow R
Yellow 42		 22910 3 5 3 4-5 4
Yellow GR
Yellow 49		 18640 4-5 4 3-4 3 5
Uranine
Yellow 73		 45350 4 3 3-4 3 4
Yellow GR Conc.
Yellow 99		 13900 3-4 4-5 4 4-5 -
Yellow 5GN
Yellow 110		 - 3-4 5 4 4-5 5
Yellow GL
Yellow 114		 - 6-7 4-5 3 4-5 5
Yellow DRL
Yellow 151 		13906 5-6 5 4 4 -
Yellow 3R
Orange 3		 10385 3-4 4 1-2 2-3 4
Orange II
Orange 7		 15510 1-2 4 2 2-3 5
Orange 2GL
Orange 10		 16230 3 4-5 3 3 5
Resorcine Brown Y
Orange 24		 20170 4 3 1-2 2 3
Milling Orange GS
Orange 56		 22895 4 4 3-4 4 3
Orange G
Orange 74		 18745 6-7 4-5 4 4-5 3
Light Fast Yellow RL
Orange 80		 - 7 5 4 5 3
Light Fast Yellow MRL
Orange 86		 - 7 4-5 4-5 4-5 4-5
Red G
Red 1		 18050 3-4 4-5 2-3 3-4 3-4
Crystal Red A
Red 14		 14720 2-3 4-5 4-5 3 4-5
Scarlet 3R
Red 18		 16255 3 5 4 3-4 4
Rhodamine B
Red 52		 45100 2-3 4-5 4 3-4 1-2
Fast Red A
Red 88		 15620 1-2 3 3-4 1 4
Scarlet R
Red 97 		22890 1-2 4-5 4 4-5 5
Maroon V
Red 119		 - 3-4 5 4-5 4-5 3
Red 3BN
Red 131		 - 3 4-5 4-5 4-5 3
Red CG
Red 151		 26900 3 4 4 3-4 5
Light Fast Red 2G
Red 183		 18800 5 5 5 4 4
Light Fast Violet Br.B
Red 184		 15685 5 4-5 4 5 4
Pink B
Red 186		 18810 4 4-5 4-5 4 4-5
Brill.Red 2B
Red 249		 18134 3 4-5 4-5 4-5 3
Scarlet ML
Red 357		 - 6-7 4-5 4-5 4-5 3
Violet 2R
Violet 1		 17025 2-3 4-5 4-5 5 4
Milling Violet 4BN
Violet 17		 42650 1 5 4 4-5 2-3
Violet B
Violet 43 		60730 4 4-5 2 3-4 1
Violet
Violet 49		 - 4 4-5 2 3-4 1
Red 10B
Violet 54		 - 3 5 5 5 3
Violet L
Violet 78		 12205 6-7 4-5 4 4-5 4-5
Bordeaux MB
Violet 90		 18762 5 4-5 4 4-5 1
Top
Patent Blue BS
Blue 1		 42045 2 4 3-4 2-3 1
Patent Blue AS
Blue 7		 42080 2 4-5 4 3-4 1-2
Erioglaucine G
Blue 9		 42090 1 4 3 3-4 2
Blue FF
Blue 15		 42645 1 4 3-4 4-5 2
Blue A
Blue 25		 62055 4 4 2-3 3 1
Blue 2G
Blue 40		 62125 4-5 3-4 2-3 3 1
Brill.Light Blue R
Blue 62 		62045 4 3-4 2-3 2-3 1
Navy Blue R
Blue 92		 13390 4-5 4-5 4-5 4-5 4-5
Fast Navy Blue 2RN
Blue 113		 26360 5 4-5 4 4-5 1
Blue 3G
Blue 158		 14880 4 4-5 4-5 4 1
Dark Blue MTR
Blue 193		 15707 6-7 4-5 4-5 4-5 1
Green B
Green 1		 10020 5 3-4 2 3-4 3
Green 6B
Green 9		 42100 1 4-5 2-3 3-4 3-4
Green V
Green 16		 44025 2 4 3-4 3 3
Dark Green B
Green 20 		20495 2 4-5 1-2 2-3 3
Alizarine Neutral Gr.BN
Green 25		 61570 5-6 4-5 4 4 1
Olive MGL
Green 85		 - 6 4-5 4-5 5 4-5
Olive MBGL
Green 104		 - 4 4-5 4-5 5 4-5
Resorcine Brown RD
Brown 14		 20195 5-6 2-3 3 4-5 4-5
Milling Brown BR
Brown 17		 20111 4 3-4 2-34 4-5 4-5
Brown M
Brown 75		 34905 4 2-3 2 4-5 4-5
Brown C2G
Brown 83		 20250 3-4 3-4 2 4 4
Brown CT
Brown 85		 34900 4 2-3 2 4-5 4-5
Brown VX
Brown 90		 17100 4 2-3 2 4-5 4-5
Brown HEDG
Brown 100		 - 4-5 4 4 4 4
Brown KDX
Brown 106		 - 6-7 2-3 2-3 4-5 4-5
Dark Brown H
Brown 121		 - 5 4-5 3 4 2
Brown RT
Brown 214		 34907 4-5 4 4 4 4
Brown SR
Brown 348		 - 4-5 4 3 3 4
Brown SG
Brown 349		 - 4-5 4 3-4 4 4
Brown MBL
Brown 355		 - 6-7 4-5 4 4-5 4
Brown M2RL
Brown 365		 - 6 4-5 4-5 4-5 4
Brown MGRL
Brown 369		 - 4 4 3-4 4 4
Black 10BX
Black 1		 20470 5-6 4 3 2-3 1
Nigrosine (W.S.)
Black 2		 50420 4 4 3 2-3 1
Milling Black BS
Black 24		 26370 4-5 4 3 4 3-4
Black VL
Black 26		 27070 5 5 4-5 5 4
Black WA
Black 52		 15711 7-8 4-5 3-4 4-5 4
Black MR
Black 172		 17596 7 5 2 4 4
Black M-SRL
Black 194		 - 7-8 4-5 3 4 4
Black NG
Black 210		 - 4 4-5 3-2 2-3 4
Black NBG
Black 234		 61570 6 4 3 4-5 4
   
Dyeing Procedure: Top
DYEING PROCEDURE FOR WOOL

Method I
This is recommended for Acid Levelling Dyes:
X% Dye
5 - 10% Glauber's Salt Calc.
 
2 - 5% Sulphuric Acid (168oTW)
or
Formic Acid (85%)
 


Enter the material (without dye) at 50oC and run for 5 minutes. Add the dissolved dye and raise the temperature gradually to the boil over 30 minutes and continue dyeing at the boil for 45-60 minutes. Rinse.

Method II
This is recommended for acid Milling & TPM Dyes: