It didn't melt because of the heat. The heat didn't help, but it melted
because of chemical decomposition. That nice foam lining that was used
in the 60's 70's and 80's just decomposes over time into some really
nasty breakdown products. They're a bitch to clean, and really not good
for unprotected metals, (I have a Canadian Proof Dollar that is no
longer Proof, because the packaging and display material was made of a
similar foam). I had four 43mm, (IIRC), filters that were stored in
their original packaging that were subjected to that breakdown. I used
a number of cleaning solutions including ethanol, methanol and
naphthalene. There's still some discoloration on a couple of filters
that wasn't entirely removed. I'd simply have chucked them except they
were special rear filters for a Vivitar S1 600mm Solid Cat. I did this
years ago so I can't tell you what worked best, I pretty much tried
everything that I didn't think would scratch the glass.
On 5/29/2013 6:24 PM, Igor Roshchin wrote:
Argh!..
Today, I pulled an old add-on x2 close-up lens (attaches as a filter),
just to realize that the foam that came with it is all "melted".
After sitting for a few years in ambience, in the closet (in hot Texas),
a piece of foam that used to cushion and prop the lens inside the box
sort of melted and left a glue-like residue on the lens.
Any ideas on what I can use to remove that residue?
Just a lens cleaning paper wouldn't work... What type of cleaning solution
(solvent?) can be used?
Thank you,
Igor
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