380 PACKING BUTTER 



they consist of copper or of some alloy containing copper such 

 as brass or german silver. These metal specks are acted upon 

 by the salt and acid in the butter. Gradually a green spot or 

 circle forms on the wrapper and on the butter at the point of 

 contact, showing verdigris, giving the butter an unsightly and 

 suspicions appearance, and actually rendering it unwholesome. 



Fig*. 76. Unit of Peters Package Machinery 



This machine forms and lines the carton, folds the wrapper and closes 

 the carton, and wraps and labels the carton. Courtesy Peters Machinery Co. 



Such butter is usually rejected by the consumer. With pro- 

 longed age the action of these metallic specks bleaches the entire 

 print and gives it a rank tallowy flavor and odor. Parchment 

 wrappers used for butter should be free from these metallic 

 impurities. 



The second wrapper is a wax paper. It consists of paper 

 coated on both sides with a thin film of paraffine, the paper 

 having been passed through a paraffine bath. The wax paper 

 wrapper furnishes additional protection against evaporation and 

 against the deteriorating action of air. Experimental trials and 

 commercial experience have demonstrated that butter actually 

 does keep better, especially is the flavor on the outside of the 

 print preserved, by the double wrapper. 



