164 Condensed Milk and Milk Powder 



Brown Sweetened Condensed Milk 



General Description. — Some of the sweetened condensed 

 milk on the market has a brown color, suggesting chocolate pudding. 

 In this condition it is usually rejected by the consumer. 



Causes and Prevention. — All sweetened condensed milk not 

 held at a low temperature grows darker in color with age. If manu- 

 factured properly and not exposed to unfavorable conditions, this 

 brown color appears very gradually and not until the condensed 

 milk is many months old. If exposed to high temperature in storage 

 or transportation, when stowed against the boiler room in the hold 

 of the steamer, or laying on the shelves of the warm grocery store 

 or drug store, etc., it turns brown rapidly. Condensed milk in cold 

 storage retains its natural color indefinitely. Where milk is recon- 

 densed (the condensed milk is redissolved either in water or in 

 fresh milk. and condensed a second time), the product is always 

 darker in color. This brown color is due to the oxidizing action of 

 heat on both, the lactose and the sucrose, a portion of the sugar 

 caramelizing. Experience has shown that the sugar is more sensitive 

 to the oxidizing action of the heat of recondensing, than when con- 

 densed the first time. 



CHAPTER XXIV 



DEFECTIVE EVAPORATED MILK AND PLAIN 

 CONDENSED BULK MILK 



The following are the chief defects of unsweetened condensed 

 milk: curdy, grainy, separated and churned, blown or fermented, 

 brown, gritty. 



Curdy, Plain Condensed Milk and Evaporated Milk 



General Description. — Curdy, unsweetened condensed milk 

 is a term used for milk in which a part of the casein is precipitated 

 in the form of lumps of various sizes. The appearance of lumps of 

 curd in this product is a defect that may render the goods unsalable. 



Causes and Prevention. — Lumps are usually due to a poor 

 quality of fresh milk, the use of excessive heat in the sterilizing 

 process and too high a degree of concentration. 



