pure vs impure Re: .... ferric citrate? can I make it?

Hi All,

I just rechecked Artcraft Chemicals and did not find ferric citrate listed (as I didn't the first time I checked)....so maybe they are not carrying it anymore - unless it is listed by another name or not in alphabetical order...or I need new eye glasses...anyway...

...it sounds like Dan has solved Charles' need for ferric citrate for the moment. But I am wondering if the $80 lb is unpurified (Science Lab also offers 17%.) and if unpurified ferric citrate will be just as effective for variable contrast control in VDB. Any of you know - by direct experience or by theory?

JT

--
Judy Rowe Taylor
Mukilteo, WA
Art is a voice of the heart, a song of the soul.
www.enduringibis.com
jude.taylor@comcast.net or judyrowetaylor@enduringibis.com
 -------------- Original message ----------------------
From: Daniel Williams <dtwilliams3@comcast.net>
> Charles:
> 
> I have a small quantity of the granular Ferric Citrate that I got from 
> TRI-ESS (no longer in business). I use it in the "variable contrast" 
> formula for VDB given in Post-Factory.  If I remember correctly, you 
> only need about 6g for a batch.  If you contact me off list I will send 
> you enough to give it a try.
> 
> Since most of my VDB is from digital negatives I find that I don't need 
> to use it very often - I can adjust the contrast of my negative.  The 
> adjusted formula I have found to be sometimes helpful when using camera 
> negs that were not intended for this purpose.
> 
> -- 
> Daniel Williams
> Enumclaw WA
> dtwilliams3@comcast.net
> www.daniel-williams-photos.com
> 
>