Re: Spectral density [was: Re: Inkjet transparencies ]

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From: Katharine Thayer (kthayer@pacifier.com)
Date: 04/03/02-03:20:08 AM Z


Joe Smigiel wrote:
>> Most of the respondants are talking about Platinum processes which may have an entirely different sensitivity in visible spectrum than >dichromates. Does anyone know for sure, >>>

That was my original question, or one of them, and I haven't got the
sense that anyone knows. I've been sifting through 3,000 messages in my
inbox the last few days; in the process I came across a brief discussion
of the spectral sensitivity of platinum, in which it seemed to be agreed
that no one knows what wavelengths the platinum sensitizer responds to.
I thought I had saved that thread, since it was relevant to my current
questions, but I can't find it now to reference it.

I started asking myself these questions when, using the same printer and
the same inks as Dan reported giving good results for platinum, I found
the orange color table method useless for gum; at any color density it
simply didn't block the UV enough to make an image; I just got a colored
rectangle. The colorize by fill method worked better, but still not
satisfactory for my needs. Sarah Van Keuren reported similar results for
cyanotype here a year or more ago, which Joe's results seem to
corroborate. I'd be curious to know whether anyone with any printer has
made an orange negative by the color table method that works for gum.

In the press of work I had to abandon my investigations and go back to
the tried and true for the duration, but now that I have more time I'll
be pursuing this again, hence my questions.

Still about as puzzled as I began,
kt


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