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.
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.
If anyone know/understand the chemistry behind this I would be interested...
Have some theories, this process have been a background interest for a
(Combination of ammonium ferric citrate + tartaric acid in gelatine did show
tendencies towards a similar result, that was an accidental mixture.)
On 10/18/06 8:29 AM, "email@example.com" <firstname.lastname@example.org> 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.
> ----- Original Message Follows -----
> From: NEIL MILLER <email@example.com>
> To: firstname.lastname@example.org
> 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
>> ----- Original Message -----
>> From: "Christina Z. Anderson" <email@example.com>
>> 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