The question concerned the spectral sensitivity of platinum/palladium.
It arose from the use of green digital negatives to make platinum prints,
i.e. what was the relationship between the light passed by the green negative
and the pt/pd emulsion ?
Terry
Incidentally just as with other 'revolutions' in photography, wonderful
though digital may be, much has been lost.
In a message dated 21/2/06 5:33:05 pm, mail@loris.medici.name writes:
> Interesting. I can print Ziatype emulsions - incorporating considerable
> amnt. of contrast lowering NaOW additive - which exhibit 30 steps with a
> 31-step tablet (read as: emulsion needs log 3.00 density range!) using the
> PDN system and 1290 printer (1280 equivalent in Europe) easily. Of course I
> have to use the stongest color G255-B0 with this emulsion, but I can
> definitely print with good dmax and specular highlights that are paper
> white.
>
>
Terry King FRPS
RPS Historical Group (Chairman)
www.hands-on-pictures.com/
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Received on Tue Feb 21 11:52:03 2006
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