Color Fastness to Perspiration
Test for alkaline and acid perspiration:Continuous contact with the human perspiration also affects the fastness of some the dyed fabrics. In fact the perspiration is found to be either slightly alkaline or acidic in nature. When fabric is subjected to this alkaline or acidic perspiration continuously some times the tone and depth of the dyed shade gets affected.
We can see how this change can be tested by artificially simulating the perspiration condition.
|Reagents required for Alkaline perspiration||Reagents required for Acidic perspiration|
|Histidine mono hydrochloride monohydrate||0.5 gram/litre||0.5 gram/litre|
|Sodium Chloride||0.5 gram/litre||0.5gram/litre|
|Disodium hydrogen orthophosphate||2.5 gram/litre||--|
|Sodium dihydrogen orthophosphate||--||2.2 gram/litre|
|0.1N Sodium hydroxide||adjust pH to 8|
|0.1N Acetic acid||--||pH 5.5|
|MLR 1:50||Dip the fabric in the above recipe for 30 minutes at 30C; allow it dwell for 14hours under 4.5 kg weight of the perspirometer.||Dip the fabric in the above recipe for 30 minutes at 30C; allow it dwell for 14hours under 4.5 kg weight of the perspirometer.|