Brian - think twice about aluminum if you ever intend to work in hot
weather. That's what I used for my 7x17 darkslides. I'll tell you that
those suckers can get pretty awfully hot down here in Arizona unless I
pretend to be a snowbird and restrict my shooting to December and
January. Hot to the touch, and of course performing a great service on
those sheets of film they're protecting. Okay for 4x5 because you can
hide them in your pack. A new dimension of logistics when they're larger
holders.
Mike Healy
On 1/29/2018 12:53 PM, Brian Smith (Redacted sender smithcbrian2 for
DMARC) wrote:
Thanks folks. That's all very interesting. I've located a local source of 1mm phenolic, so am now tossing up between that and anodised aluminium. Regards - Brian
------------------------------------------------------------------------
*From:* bobkiss caribsurf.com <bobkiss@xxxxxxxxxxxxx>
*To:* "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
*Sent:* Tuesday, 30 January 2018 8:13 AM
*Subject:* [pure-silver] Re: pure-silver Digest V5 #9
/"Depends on how it was vulcanized" /I guess they wanted them to live long and prosper!/
/
------------------------------------------------------------------------
*From: *"`Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
*To: *"pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
*Sent: *Monday, January 29, 2018 2:21:28 PM
*Subject: *[pure-silver] Re: pure-silver Digest V5 #9
But this was before Bakelite became available. I think Ebonite was used until quite late but its transparent to IR. If you look at the silver edge of the handle crimped on the darkslide you will find a series of raised dots on those that are IR opaque.
Before Bakelite and similar resins became popular in the 1930s hard rubber was used for all sorts of things like pot handles, knobs, electrical insulators. When it gets old enough hard rubber may begin to have some yellow sulfur stain on it. Depends on how it was vulcanized.
On 1/29/2018 10:03 AM, Martin magid wrote:
FWIW, Cassells Cyclopedia of Photography(1911) states dark slides
at that time were either ebonite or aluminum.
Marty
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx <mailto:dickburk@xxxxxxxxxxxxx>
WB6KBL
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