Questions
1. Why should more care be exercised in washing colored goods than white?
2. How may colored fabrics be tested to show that they stand the action of soap solution?
3. Does a moderately warm temperature (131° F.) affect the fastness of colored fabric?
Experiment 38—Test of Fastness of Color under Friction
Apparatus: Yarn, white unstarched cotton fabric.
Materials: Fabrics worn near the skin.
Reference: Textiles, page [242].
Directions
Stockings, hosiery yarns, corset stuffs, and all fabrics intended to be worn next to the skin must be closely knitted to withstand friction and must not rub off, stain, or run, that is, the dyed materials must not give off their color when worn next to the human epidermis (skin), or in close contact with other articles of clothing, as in the case of underwear.
In order to test two fabrics to see which is the better, it is necessary to rub the fabric or yarn on white unstarched cotton fabric.
In comparing the fastness of color of two fabrics it is necessary to have the rubbing equal in all cases.