[alt-photo] Re: Don't take the brown FAC!

[Loris Medici]

Yes, didn't mentioned that as I thought that was obvious; such a drastic
change will most probably require to work out new exposure time/negative
color/curve... But I'm sure brown FAC is equally usable as the green
variant, so you may relax about that.

Regards,
Loris.


-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org On Behalf Of
Alberto Novo
Sent: Tuesday, May 04, 2010 5:20 PM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: Don't take the brown FAC!

Trevor,
brown and green ferric ammonium citrate have different Fe/NH4/Cit. ratio and
pH (Clerc reports two different formulas, though they are usually sold
declaring two different Fe percentage ranges), so the best is to calibrate
again your curve. 

> Hey gang,
> 
> Well, after a long wait, I finally have chemistry for gum and 
> cyanotype...or so I think. I opened my FAC and discovered that it 
> looked VERY brown.
> ...