1. The large majority of machine-made bottles with a slight to moderate lavender or amethyst tint – indicating manganese oxide was used as the decolorizer – date between 1905 and the early 1920s (top picture above right; click small amethyst wide-mouth bottle for a picture of this entire bottle) though some can date as late as the 1930s. Machine-made soda bottles were generally not a).
dos. The massive greater part of servers-made bottle with a soft “straw” colour tint (base photo more than correct) – exhibiting selenium and you may/or arsenic play with while the an excellent decolorizer – will date no sooner than 1912 (Lockhart 2006a & b). Considering empirical findings, one otherwise these two decolorizers will still be being used now although pursuing the sixties almost every other decolorizing agencies and you will glass promoting procedure were used leading to quicker plentiful “straw” shaded bottle.
“Bubbles” try sky otherwise gas-filled cavities during the cup. The image to the left is actually a near-up off a bottle with bubbles in the atypically large numbers for illustrative objectives. Bubbles are caused by a variety of problems on the manufacturing processes along with single men dating in Houston city a cup cooking pot otherwise container which had been too beautiful or perhaps not full adequate, cup clipped-from or shearing problems, and other gob feeder difficulties.