ncoats, etc., are
expected to be rainproof. These fabrics are tested by plaiting with
undyed yarns and left to stand all night in water. Notice whether the
color of the fabric has run into the undyed yarns.

Take a sample of the fabric and shake some drops of water on it.
Notice whether it loses its luster when the drops have dried. Spotting
may be prevented by placing a damp cloth on the wrong side of the
material; roll the two together, and when evenly damp, unroll and
press through the damp cloth with a fairly hot iron.

Place a piece of the fabric in the sun so that the sun and rain may
come in contact with it. Notice whether it loses its color and becomes
gray and dull.

=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?

=Experiment 42--Test of Fastness of Color against Street Mud and Dust=

Apparatus: Porcelain dish, lime, and water.
Materials: Cotton, silk, and woolen fabrics.
Reference: _Textiles_, page 243.

Ladies' dress goods are expected to withstand the action of mud and
dust. In order to test a fabric for the resistance, the sample should
be moistened with lime and water (10