On Sat, 3 Dec 2016, Fred Cisin wrote:
On Sat, 3 Dec 2016, drlegendre . wrote:
Interesting find, thanks for posting this. I've seen this as well. with
a batch of old ICs which had been stored (in black foam) for some 20-30
years. The leads kind of just stayed behind in the foam.. My assumption
was that the foam was simply hygroscopic, and held enough atmospheric
moisture & pollutants to foster corrosion.
There are numerous black foam formulations.
I inherited some lenses (including a Leitz Tele-Elmarit 180mm (<250
made)) that had been stored for a few decades in an essentially airtight
case with black foam. When I first opened the case, it seemed as though
there was liquid in the case, with an intense vinegar? smell. Second
time that I opened the case, a few hours later, it was dry and crumbly,
and the outer painted surfaces of the lenses were badly pitted and had
to scrape bits of the foam off, but NOT at all like water damage. It
turned that lens from mint condition and a major rarity, into usable but
POOR cosmetic condition (a loss of more than a thousand dollars in
value!). (Three other cases had simply disappeared between the time my
buddy died and the time that the county let us go through the house.)
Something similar happened with a Nikon FT2, Nikon EM, and some lenses
after a local friend of mine passed away in 2001. The same also happened
with his HAM radio gear, which I was supposed to get. For much of the
radio gear, I could likely come up with the model/serial numbers too. (We
know who took the HAM radio gear, but couldn't really do much about it.)
http://strudel.ignorelist
.com/~tothwolf/classiccmp/stolen_nikon_camera_gear.txt
