Thanks Sandy that makes it a bit more clear :)
In a message dated 10/3/05 8:43:21 AM, sanking@CLEMSON.EDU writes:
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>
>
>
> Mark,
>
>
>
>
> Yes, it is possible to set the exposure scale to whatever you want, within
> limits, especially if you use the Na2 method of contrast control. By
> adjusting the amount of Na2 it is possible to set the ES from as much as 1.9 to as
> low as 0.8.
>
>
>
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> However, what I choose to do is set the exposure scale of straight palladium
> very close to the upper limit, which for me is around 1.85. This can vary a
> bit of course based on choice of paper. Then I develop all of my negatives to
> this range, whether they be in camera negatives or digital negatives, and I
> don't have to worry about adding any Na2.
>
>
>
>
> I usually add just a tiny bit (about 1 ml per liter of developer of a 5%
> potassium dichromate solution) to the developer for better clearing. This small
> amount does not affect ES very much, if at all, but my papers seem to clear
> better with it.
>
>
>
>
> Your question does make the point, that we might should be more specific
> when discussing these issues. To that end I will mention that my normal mix is
> equal parts of a 25% solution of ferric oxalate and 20% palladium chloride. I
> develop in potassium oxalate, at room temperature.
>
>
>
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> Sandy
>
>
Best Wishes,
Mark Nelson
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Received on Mon Oct 3 12:20:43 2005
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