Re: (Fwd) Re: I guess I'll do it, too.

[John Sparks <sparks@xxxxxxxxxx>]

Scott Donkin <photos@xxxxxxxxxx> writes:

>At 03:37 AM 07/12/96 +0000, you wrote:
>
>>An aside:  The small series of notches on the dark slide (usually there
>>are five) indicate that the slide is IR-proof.
>
>I had heard of that too, and I know it was true for the slides made, say,
>twenty or so years ago.
>
>However, some of my slides are Lisco, and others are made by Toyo.  I
>haven't got them here to look at, but I do know that one set has more dots
>than the other (about seven dots), yet both brands have tested to be IR safe.
>
>This leads me to the conclusion that the manufacturers don't bother with the
>number of dots meaning anything(??).

I have some 4x5 and 8x10 holders made by the same company within a couple
of years of each other out of apparently the same materials.  The 8x10 holders
have several more dots on the slides than the 4x5 holders.  I don't think 
they mean anything anymore except which side of the slide has the white strip
(so you can find it in the dark).  In any event, all the holders I tried (the
oldest was made about 1980) seem to be IR safe.

John Sparks

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Topic No. 2