Re: ferri sesquichlorati
Hi :-) have had some interest in sesquichloride of iron Here with pigmented gelatine, roughly after "The Silver Sunbeam" recipe, too thick layer of gel - sharpness bad. Positive process, I had no luck with gum, but did not try very hard... Sensitivity pretty low, this is 30 minutes exposure with a 2kw metal halide bulb at 75 cm. The white parts are the exposed areas Thick layer is partly to blame for the low sensitivity. http://www.deviantart.com/deviation/33790868/?qo=1&q=by%3Ahalvor+in%3Ascraps &qh=sort%3Atime Copy paste whole link. I believe there is some connections to the pellet process too and the Ferro-Gallic...(??) at least chemicals involved are about the same. http://unblinkingeye.com/Articles/Cyano/cyano.html If anyone know/understand the chemistry behind this I would be interested... Have some theories, this process have been a background interest for a while... (Combination of ammonium ferric citrate + tartaric acid in gelatine did show tendencies towards a similar result, that was an accidental mixture.) Halvor http://halvor.deviantart.com/ On 10/18/06 8:29 AM, "zphoto@montana.net" <zphoto@montana.net> wrote: > Thank you, Neil! Yes, this is in a book from 1900, so it is > an old term. It is a gum process wherein you include this > in the gum mix! I was going to give it a go. But I guess I > don't have ferric chloride so it'll have to wait. I do have > lots of FAC. > > Sometimes it is such a pain figuring out how to translate > old chemistry terms. > Chris > > ----- Original Message Follows ----- > From: NEIL MILLER <nkd.miller@btopenworld.com> > To: alt-photo-process-l@usask.ca > Subject: Re: ferri sesquichlorati > Date: Tue, 17 Oct 2006 15:53:14 +0100 > >> I think it's the same stuff as in Towler's "The Silver >> Sunbeam," 1864, as sesquichloride of iron, aka ferric >> chloride. >> >> Regards, >> Neil. >> >> >> ----- Original Message ----- >> From: "Christina Z. Anderson" <zphoto@montana.net> >> To: "Alt, List" <alt-photo-process-L@usask.ca> >> Sent: Tuesday, October 17, 2006 3:17 PM >> Subject: ferri sesquichlorati >> >> >>> Help! Chemists, what is this "ferri sesquichlorati"? >>> Ferric ammonium citrate? Ferric oxalate? Potassium >> ferricyanide??? I think it is a German >>> word?? >>> Chris
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