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Old 02-11-2009, 05:13 PM
Dennis
Dazzled by the Cosmos.

Dennis is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 11,703
Some time ago I purchased some 99% IPA from the Chemist – I had to show him my book on cleaning optics before he would sell it to me, for fear of misuse.

I think that anything less than 99% proof “may” be contaminated with other additives. IIRC, one post on sci.astro mentioned that some sort of oil was added to cheaper solutions and this would leave a film after the alcohol had evaporated.

The above comments are made up mostly of memory recollections and is not qualified advice, just a warning to check!

Cheers

Dennis
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