U of S | Mailing List Archive | alt-photo-process-l | Re: gum preservatves

Re: gum preservatves

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  • Subject: Re: gum preservatves
  • From: ric kb <ric_kb@yahoo.com>
  • Date: Wed, 03 Sep 2008 18:57:09 -0700 (PDT)
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melts plastic. used as part of plastic glue. may melt kidneys, not a food additive, unless Cheney wins.
CAUTION: and exclusionary clause, put here by my attorney. If you can't figure out the truth in the above stop listening, FOX is on and ready to entertain you.

--- On Wed, 9/3/08, Judy Seigel <jseigel@panix.com> wrote:

> From: Judy Seigel <jseigel@panix.com>
> Subject: gum preservatves
> To: alt-photo-process-l@usask.ca
> Date: Wednesday, September 3, 2008, 6:26 PM
> Long ago (practically at the dawn of time) the list ran a
> thread on 
> preservatives for gum. In those days I still had some
> formaldehyde and 
> mentioned that one or two drops in a 2 to 4 ounce dropper
> bottle of gum 
> preserved it, as far as I could tell, permanently.
> I bought some of the other materials mentioned, but
> didn't test them 
> rigorously -- tho I mention for those whom it may concern
> that they 
> included salicylic acid and 15% thymol in  methyl alcohol.
> I don't think I 
> got but it was mentioned, some form of lavender, which can
> give a lovely 
> aroma, if nothing else.
> While I was in the cabinet, meanwhile, I picked up a tube
> of something 
> marked "MEK Peroxide in Dimethyl Phthlate:  Danger:
> causes severe burns."
> Does anyone have a clue what that is or does?
> Finally, there was another chemical, probably a powder,
> which smelled like 
> a doctor's (or dentist's) office, and had the word
> -- as I recall -- 
> something carbon or carbonate. That was in the cabinet too,
> but the name 
> escapes me now, the smell is gone, and I don't find
> it... Any clues?
> I don't use any of the above myself these days because
> I found that Daniel 
> Smith's prepared "regular" (not
> "Premium") gum arabic was excellent & 
> bought an extra gallon from the lot I liked best. (Now,
> needless to say, 
> it costs 2 or 3 times what I paid for it, but the dry stuff
> probably does 
> too.) The prepared gum has the preservative already in it,
> & seems to keep 
> forever.
> IME they all darken in time -- IN THE CONTAINER -- but
> I've tested them 
> with the dichromate, pigment and exposure, and never found
> any difference 
> in the printed color, except SLIGHTLY darker in a pure pale
> yellow.
> However, the caveat is that each year gum arabic is
> different, according 
> to several variables, including rainfall in the acacia
> groves. So try it 
> before you buy a barrel-full.
> J.