3. Why is a brown ring often left after removing a stain?
4. How may grease and blood stain be removed from wash goods?
5. What is wheel grease? How may it be removed?
6. How will ammonia remove acid stains?
7. Does it remove all? Why not?
8. Explain the method of removing blood stain from cloth.
Experiment 20—Dyeing Wool
Apparatus: Large porcelain dish or casserole, filter.
Materials: Undyed piece of woolen and worsted fabric, undyed yarn, and undyed raw cloth.
Reference: Textiles, page [65].