Grade 



Date 



EXERCISE 41. 



(65) 



Object. — To determine the percentage of water in butter. 



Apparatus. — Set of balances; samples of butter; some type of moisture 



test device as the Ames, Irish, or Marshall test. 

 Step 1. Put samples of butter in clean dry bottles or jars with tight lids or 



caps, warm up, but do not entirely melt the sample, until it can be 



thoroughly mixed. Mix. 

 Step 2. Carefully weigh out 10 grams of the sample into a heated, weighed 



dish or cup; heat over the flame or in an oven at 175° to 180° F., until 



it ceases to lose weight. 

 Step. 3. Take the difference between original weight and final weight and 



compute the percentage of moisture. 



