Re: Reduced Dmax with overexposure in Pt/Pd

[Sandy King <sanking@clemson.edu>]

Eric,


>As you have seen,  your
>results don't match what you have heard about SA lights and pt/pd.  Perhaps
>it is all in the mix?


The truth is a little more complicated in that what I have heard from 
Pt/Pd printers varies a lot. Several who have communicated with me on 
the subject agree with you that they get faster printing speeds with 
the SAs. Quite a few others claim the BLs are faster.

As you say, perhaps it is all in the mix.

In any event I am not a dedicated Pt/Pd printer and there is no 
question in my mind but that the BL tubes are a much better choice if 
one prints with several processes as I do.

Sandy



>
>I have only seen an increase in speed and contrast with my mixtures after
>switching to SA lights.
>
>EJ Neilsen
>
>
>----- Original Message -----
>From: "Sandy King" <sanking@clemson.edu>
>To: <alt-photo-process-l@sask.usask.ca>
>Sent: Sunday, May 05, 2002 9:43 PM
>Subject: Reduced Dmax with overexposure in Pt/Pd
>
>
>>  With reference to the Pt/Pd results that I reported earlier today,
>>  there was an  anomaly that surprised. When making test prints with a
>>  step wedge I generally overexpose by 2-3 stops. What I noticed in
>>  looking at the curves, and this was true of curves with all of the
>>  lights tested, is that there is actually a rather significant
>>  decrease in Dmax, or maximum density, with overexposure. By
>>  significant I mean between log 0.05 - 0.10.
>>
>>  Is this something that one generally expects to encounter in platinum
>printing?
>>
>>
>>  Sandy King
>>
>>
>>  --
>>


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