willong
Well-Known Member
Mold lines or "seams" can end before reaching the top on machine made examples of milk bottles dating after 1903. The tops were fire polished to elimate those lines that could possibly give bacteria a place to hide. Milk bottles are one of the rare exceptions to the mold line method of determining if a bottle was hand blown or not.
Thanks for that tidbit sandchip. While I am familiar with fire polishing, I never knew that it was applied to machine-made milk bottles in that manner.