. Study of fabrics. er, this test is not reliable, al-though something may be learned if the yarnis unraveled so that the fibers may be burnedseparately. Cotton burns quickly, leaving asmall amount of ash and no perceptible burns slowly, leaving a black ash in theform of a ball at the edge of the flame. Theodor of burning wool is that characteristic ofburning bones or feathers. Experiment.—Select a number of materialswhich it is thought may contain cotton. Bumthe warp and weft threads and threads of dif-ferent colors separately. If a thread whenburned gives off no odor of burning woo
. Study of fabrics. er, this test is not reliable, al-though something may be learned if the yarnis unraveled so that the fibers may be burnedseparately. Cotton burns quickly, leaving asmall amount of ash and no perceptible burns slowly, leaving a black ash in theform of a ball at the edge of the flame. Theodor of burning wool is that characteristic ofburning bones or feathers. Experiment.—Select a number of materialswhich it is thought may contain cotton. Bumthe warp and weft threads and threads of dif-ferent colors separately. If a thread whenburned gives off no odor of burning wool, it maybe taken as a strong indication that it is all cot-ton. However, the odor of burning wool doesnot indicate that the thread is all wool. Chemical Test for Any Mixed Cotton andWool Fabric.—Boil a sample for 15 minutes ina 5% solution of potassium hydroxide. If it isall wool, the entire piece will be destroyed; ifit is mixed with cotton, the cotton will be leftand the wool destroyed. Should there be a res-. Original Residue 54 inches wide—$ per yard
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Keywords: ., boo, bookcentury1900, bookdecade1920, booksubjectclothinganddress
