you guys are on to something one of the scientific glassblowing co. i worked for had just a system they had a white grandular substance and as it was used it turned a light purple from the bottom up and when it was all purple they changed it.
had to do with trying to keep inpurites out of the glass, should keep water out of the back side but not the side of the jar you are on. i had a time figured out to take my blow hose and sling it like a sling shot around and around. worked o.k. until i forgot. of course you looked kindof funny maybe a little like david vs. goliath.
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