Hello,
I bought a Wollensak Verito 18". Glass is in mint condition except for an almost 1/2 inch thick ring of balsam oxidation. I have a friend with a small optics workshop (he produces prisms, lenses, doublets for medical equipment, but nothing as big as this lens) and he offered me to re-cement it. But he normally uses that UV type cement and we agreed that Canada Balsam would be more suitable and more forgiving in case of any problem. But there are two types: natural and synthetic. Any insights on which one to pick?
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