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Over the years milk has been packaged in a wide variety of different types of milk bottles. While nearly all of them are collected to some extent there is one specific sub-niche that attracts the most collector interest and that sub-niche is 1 quart Pyro-Glaze milk bottles with diary town and state names on them. Pyro-Glaze (also called "Pyro" or "Painted) refers to the method by which colored graphics were applied to the bottles. Pyro-Glaze bottles are found with various graphics & colors mostly in red green blue orange and black. They were made in several sizes and shapes but our focus here will be on a very narrow sub-niche of these bottles. These bottles were used by thousands of dairies across the country making it nearly impossible to catalog all the varieties that exist.
Short and medium chain fatty acids with 4-12 carbon atoms which occur at comparatively higher concentration in milk fat reported to have antibacterial and fungistatic activity. Milk fat plays another important role in preventing tooth decay by forming a protective coat over the surface of enamel. It is composed of triglycerides of fatty acids. A fatty acid molecule is composed of hydrocarbon chain and carboxyl group. Triglycerides are of two types simple and complex. In simple all the three fatty acids are of same nature whereas complex triglycerides on hydrolysis give glycerol and different fatty acids. The milk fat exists in the form of small globules of sizes ranging from 2 to 10 microns with different glycerides of low melting points in suspension.
Milk fat varies in amount and composition according to the breed species feed and lactation time of which feed being a major factor. Fat is distributed in globules as triglycerides (98-99 %) fat globule membrane in combination with phoshpholipids and lipoprotein (0.2 to 1.0 %) and also as free fatty acids cholesterol and phospholipids in the serum. Phospholipids These contain phosphorus in their molecules in addition to the fatty acids and glycerol; they also contain a nitrogenous base. Principally milk phospholipids are the Lecithin Cephalin and Sphingomyelin. Though fat-soluble they are hydrophilic and imbibe large quantity of water and swell. They are used as antioxidants for fat rich dairy products. Vitamins Various vitamins present in milk are as follows.