Weigh 5 gram samples of gelatin into 100 cc. of cold water in beakers or jelly glasses. Allow it to soak over night. Then heat slowly, with stirring, to 80 degrees C.
Subject to the following tests and make report on opposite blank page.
1. Note the odor.
2. Determine the time required for 50 cc. to run from a pipette.
3. Determine the time required for the sample to gelatinize.
4. Turn the jelly out on to a plate and determine the relative resistance of the different samples to pressure by the finger.
Two or more students should be assigned to this exercise at a time, each having a different sample of gelatin. They should perform the tests together.
EXERCISE XXIX REPORT