Experiment 40—Test of Fastness of Color in Sunlight
Apparatus: Cardboard.
Materials: Silk, woolen, and cotton fabrics.
Reference: Textiles, page [244].
Directions
Cover one end of the sample of cloth with a piece of cardboard. Expose the fabric to the sunlight for a number of days and examine the cloth each day and notice whether the part exposed has changed in color when compared with the part covered. Count the number of days it has taken the sunlight to change the color. Does direct sunlight have any effect upon colored fabrics? Which is the most affected by the sun, silk, woolen, or cotton fabrics, dyed with same dyestuff, in the same length of time? Are fabrics changed any sooner by the sun than by the weather?
Experiment 41—Test of Fastness of Color to Weather, Light, and Air
Materials: Cotton, silk, and woolen fabrics.
Reference: Textiles, page [244].
Directions
Examine various fabrics for fastness to weather, light, and air by placing samples outside of a window so that they will be exposed to the weather, light, and air. Have duplicate samples of the above away from the weather and light. Compare the samples exposed to the weather with those in the house and note the number of days it takes to change. Classify the fabrics. Which of the fabrics are most easily affected by the weather, light, and air?