From: pete (temperaprint@blueyonder.co.uk)
Date: 03/04/03-08:50:39 AM Z
Ed,
>From my experience and Testing once the stain has gone when employing dilute
sulphuric acid (or as I tend to think changed into a very light grey
compound) it stays like that.
Pete
--http://www.books.i12.com/parlour/index.html
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> I decided to try this, but thought I would take a suggestion from Terry King
> and put down an unpigmented coat of gum first, to prevent pigment staining
> later. After soaking for 24 hours I had a grey stain that I assume is
> chromium. I added some sulphuric acid and soaked overnight and the stain is
> slowly going away--I expect it will be gone when I return home this evening.
> My question is, will I have this same stain problem with every layer I
> print? I'm using Fabriano Uno, pre-shrunk and gelatin sized.
>
> ----- Original Message -----
> From: "Christina Z. Anderson" <zphoto@montana.net>
> Anyway, unsized
>> Rives BFK, 6g of lamp black pigment mixed into 12 ml of gum arabic from
>> Daniel Smith, mixed equally with am di at 24% (12g per 50ml) that has been
>> sitting around in my cupboard for 4 years and still works just FINE (and
> so
>> does the 4 year old gum AND the four year old mixed pigments) made a
>> wonderfully rich one coat, deep, black, moody print. I was taking
> Livick's
>> word on his astronomical (to me) amount of pigment he uses in his gum
>> solution. We were taught to mix 3g pigment into 50 ml gum!! Livick's is
>> 8.33 times that amount! And I chose lamp black because of its staining
>> capability/high coverage capability so that if Livick was overmixing his
>> gum/pigment ratio, it should appear---not that this is the quinacridones
> or
>> thalos, tho. I coated half the print in the old ratio, half in Livick's,
>> on alum and unsized paper both, exposed at 12 minutes and 24 minutes under
>> the UV lightbox (Edwards) and then did my full print on unsized Rives BFK
>> paper at about 8 minutes. The old color formula was quite anemic, and not
>> worth it, so even if I was multiple coating I would mix way more pigment
>> into the gum than 3g, for lamp black anyway.
>
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