Reactive Blue 21
(Re. Turquoise Blue G)
0.50% 9 4.00%
Shade Illustrated
 
Characteristic C. I. Reactive Blue 21
C. I. No.  
CAS No. 12236-86-1
Chemical Class Reactive Azo Dye
 
Properties Solubility (g/l at 30°C) 80
HT-dyeing of polyester/cotton
fibre blends  (two-bath dyeing)
Suitable
 
Fastness standard depth 1/25 1/25 1/25 1/25 1/25
Standard Daylight 3-4 4 4 4 4
 
Standard Depth 1/1
Washing 60°C 4-5 4-5 4-5
Washing 95°C 4 4-5 4-5
Perspiration acid 4-5 4-5 4-5
Perspiration alkaline 4-5 4-5 4-5
Peroxide bleaching 4-5 3-4 4-5
Rubbing dry 4-5  
Hot pressing dryimmediately 4  
Alkali 3  
Mercerizing 3 4-5  
Acetic acid 3 3-4  
 
Exhaustion curves Saturation curve
2
Exhaustion curve
3
 
Possible Application Processes DYEING :
Exhaust Dyeing
Pad Batch
 
PRINTING :
One Phase Printing
Two Phase Printing
 
Explanations 0 Suitable
1 Partially Suitable
4 Unsuitable
 
The fastness data given in tables denote
1 - Very Poor
2 - Poor
3 - Moderate
4 - Fairly Good
5 - Good
6 - Very Good
7 - Excellent
8 - Unsurpassed
 
Saturation and Exhaustion Curves
Saturation curves express the dyeing saturation in dependence on the increasing dye concentration in the dyebath. From them it is possible to determine the saturation point of the dyestuff, i.e. the maximum effective dye concentration. On the X axis there are assigned the integrated reflectance „I“ values
5
 
Where K/S is the Kubelka -Munk œ equotion 6
7is surface reflectance
8are the colour matching response functions for the D65 light and 10°standard observer
 
Exhaustion curves were designated from initial concentration of 1/1 standard depth by standard exhaustion method and show the amount of the dye exhausted from the dyebath in dependenc on the dyeing time.
 
The above provided data is true to the best of our knowledge as on date and does not hold any guarranty.