[alt-photo] Re: dilution of pt/pd

[Mark Nelson]

Thanks Clay!

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Jul 24, 2010, at 6:33 AM, Clay Harmon Website <clayh at clayharmon.com> wrote:

> Mark, adding oxalic acid to the FO will shorten the exposure time. I tested this years ago, and it is increases the light sensitivity of the coating solution. And slightly increases its exposure scale. And makes it easier to clear. No downside to adding it that I was ever able to detect. My formula is 27g FO, 4g oxalic acid, 2g EDTA to make 100ml. I think this is a pretty standard mix.
> 
> clay
>> 
>> I would be interested (like David) in hearing comments about adding oxalic acid to FO and the purpose for doing soo make it dissolve easier?  Does the FO from B&S have oxalic acid added to it?
>> 
> 
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