Experiment No. 14
Determining the Per Cent of Skin in Beans
Place in an evaporating dish 10 gm. of beans, 50 cc. of water, and ½ gm. of baking soda. Boil 10 minutes or until the skins are loosened, then drain off the water. Add cold water and rub the beans together till the skins slip off. Collect the skins, place on a watch glass and dry in the water oven for ½ hour. Weigh the dried skins and calculate the per cent of "skin."
1. What does the soda do? 2. What effect would hard limewater have upon the skins? 3. How does removal of skins affect food value of beans and digestibility?