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On May 3, 9:36�pm, jean-philippe planas 
wrote:
> Hello Bill,
>
> When you say Shellac is soluble in alcohol, do you liquid (hot) Shellac or dried Shellac?
> In this case is it a good idea to clean bubble sextants optics with alcohol?
> JPP
>
> engineer  wrote:
>

Once the shellac has cooled, most of the excess can be carefully
chipped off the glass, Small remnants clean off with alcohol. Remember
that French polish(vernissage au tampon) is shellac dissolved in
alcohol. There is I am sure no harm in cleaning bubble chamber lenses
with alcohol as long as you take care not to flood the mounting. Take
care, though, with lenses in antique equipment. Sometimes they were
shellaced into place rather than spun; and don't go near cemented
achromats with xylene, which softens Canada balsam.

Bill
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