Re: Potentially stupid pt/pd question

[Clay <wcharmon@wt.net>]

Rinsing the print may be your problem. If your water is above pH  
neutral (>7.0), the rinse itself can lock the ferric oxalate into the  
paper fibers. I would put the print straight into the first clearing  
bath, which should ideally be something acidic - say 1-2% citric acid  
or HCl. Stain is caused by the unused ferric not being removed, not  
by the developer. In fact, one trick is to let it soak in the  
developer for 5 minutes or so before you move it to the first  
clearing bath. Your developer will eventually load up with ferric,  
but it is effective as long as the pH of the developer is around 6.0  
or so.

Clay
On Oct 16, 2006, at 4:48 PM, Camden Hardy wrote:

> So I'm looking at this test print again, and just noticed  
> something.  The
> stain wasn't caused by the emulsion.  It was caused by the potassium
> oxalate.
>
> Any recommendations on getting all the developer out, or will I  
> have to
> use it one-shot?  I rinsed the print before putting it in the
> clear...should I just rinse it longer?
>
>
> Camden Hardy
>
> camden[at]hardyphotography[dot]net
> http://www.hardyphotography.net