Re: Best CI for process

Hi Eric,

Just for reference, how do you figure your exposure scale? I know this
sounds like a dumb question, but I have seen it defined differently by different
people. Do you include the first paper white step also?

Sandy, could you also respond to this question?

Thanks,
Best Wishes,
Mark Nelson
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In a message dated 10/3/05 1:03:42 PM, e.neilsen@worldnet.att.net writes:

> Sandy, I don't use or test a pure palladium. The smallest amount of
> platinum
> that I add is 15% of total metal salt solution. I make my own ferric oxalate
> and use a palladium solution that is mixed at 5 g NaPd with 3.5g NaCl to
> make 40 ml. This makes a .7 M solution to match my .7 M ferric oxalate. The
> Platinum is a .457M solution in potassium version and .7M when I can get the
> ammonium version. The molarity may be off by +/- .015 as these are from
> memory but I don't think so.  
>
> My exposure scale for the 1.0ml FO, .15ml K Pt, and .85ml Na Pd, is 2.45.
>
> I make most of my exposures after a 10 minute dry@ 100F and a  30 minute
> humidification @60% RH. I process in Potassium Oxalate at both room temp of
> 70 and heated to 90F. The exposure test that produced the ES above was
> processed at 70F.
>
> These test were also performed with Starphire glass in the contacting
> printing frame.
>
Received on Mon Oct 3 12:36:42 2005