Re: IR opaque film holders

[Bill Agee <billagee@xxxxxxxxxxxxx>]

>On Sat, 26 Apr 1997 19:07:53 +0100 (WET DST), Russ Rosener wrote:
>
>|most of the holders have these raised dots. However most are wood and a
>|few are plastic. Will this effect the IR film if the holder is wood or
>|plastic?
>
>Plastic is suspect until proven otherwise.  That is, the IR-safety
>depends on the plastic involved.  Wood is suspect, period.  IR has an
>astonishing ability to penetrate wood.  Test the holders you have if
>you want, but expect that probably the Riteway will prove safe, the
>wood holders not.
>
>I keep getting the urge to go back to 4 x 5 HIE, but I wonder whether
>I've kept the sliders with the holders they came with.  The five dots
>presumably refers the the IR-impenetrability of the slider, rather
>than that of the holder; but if that statement is untrue, I'm not sure
>the dots can be relied on to indicate the safety of the holders after
>all these years.  And the same may go for purchased holders:  How do
>you know that those sliders came with those holders?  I guess if
>they're Riteway *and* the sliders have five dots you're safe.
>
>Bob Long
>(boblong@xxxxxxxxxxx)

I never had any problem with 4x5 holders and 4x5 HIE.  Obviously, if you
are concerned, make a test.

Bill Agee


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BILL AGEE
Laguna Beach, California           http://www.redsilver.com

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End of INFRARED-PHOTOGRAPHY Digest 275
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