Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Wed, 28 Jul 1999 16:41:06 -0400
Gary Miller wrote:
> The contrasting agent that I am using is the typical solution number 2 from
> B&S;
>
> ferric oxalate 6.5 g
> potassium chlorate 0.33 g
> water to make 25 ml
> ...
That's 1.32% PC which, in my opinion, is way too much (WAY TOO MUCH)(to
the moon!). For a 4x5 I might typically add 1 drop of 0.25% solution PC
into 12 drops coating for a total solution % of 0.0192%.
Further I have found that some paper can be degraded with more than a
drop of 0.5% PC for the 12 drop 4x5 coating and surely at more than
1.0%. One drop of 1.0% PC with 12 drops coating would equate to 0.0192
grams PC into the 25 ml ferric oxalate.
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
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