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You can find some good information regarding how to identify reproductions along with some pictures of known reproductions from various online sources. If you are interested in learning more about these bottles there are two books currently available that provide some excellent information about how they were made and used along with some basic pricing information. The book are titled "Udderly Beautiful" and "Udderly Splendid" by John Tutton. Both give some rarity and pricing information but because of the large number of bottles produced they don t cover even a small fraction of the bottles produced. Both can be found for sale on either eBay Amazon or in some antique shops. Other sources of information are The National Association Of Milk Bottle Collectors and the individual web sites many of their members maintain.
You can reduce your risk by initially setting a limit of $10 rather than $20 but if you are not comfortable with a little risk and taking a small loss of some of the bottles you buy then this is a sub-niche you should avoid. Here are some additional general hints & tips to remember when purchasing these bottles...Never buy a bottle that has any chips or cracks no matter how small or seemingly insignificant. The condition of the Pyro-Glaze design is extremely important - avoid any bottles that have chipped faded or scratched Pyro-Glaze as well. These bottles were to be used and then returned to the dairy where they were cleaned and reused. After extended use and cleaning some developed numerous small scratches to the glass. You should avoid bottles that exhibit severe scratching.
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.