Re: Copper in bromoil bleach

[Alberto Novo <alnovo@inwind.it>]

As for the copper sulphate, it should not contain any other substance. To be sure, prefer that one in very large crystals.

Alberto

> yall need to be careful about buying chemicals from garden stores, sometimes they contain stuff along with the chemical and are not chemically pure. the impurities may interfere with your process. peg  
> --
> Peg Fredi
>   -------------- Original message from Projekti Vedos <vedos@samk.fi>: --------------
>
> Thanks Chris,
> I'll try a gardening store for cheaper copper sulfate, didn't know that! (I wonder if gardeners know alt-photo printmakers can use that stuff too ;) The prices of sulfate and chloride are about the same at the place where I buy them.
> But yeah, I could as well try chloride and see if it works...
> - Jalo
>
> ----- Original Message -----
> From: "Christina Z. Anderson" <zphoto@montana.net>
> Date: Tuesday, April 15, 2008 18:55
> Subject: Re: Copper in bromoil bleach
> To: alt-photo-process-l@usask.ca
>
> > Jalo,
> > No one has responded probably because no one knows, but from
> > experience,
> > copper chloride reacts a lot faster than copper sulfate in
> > mordancage.  BUT
> > the tanning that occurs, which is so important in bromoil, is
> > from the
> > dichromate, not the copper sulfate--doesn't the copper sulfate
> > just bleach?
> > So I would try one print and see if it works and please let us know!
> >
> > Another thing--there sure is a price difference between the two
> > :) We can
> > get bags of the copper sulfate at gardening stores here.