Re: Gum discovery by S. Melvin -- maybe

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From: Tom Ferguson (tomf2468@pipeline.com)
Date: 03/12/02-06:40:33 PM Z


On Fabriano paper, gelatin size, glyoxal hardener, and WN tube paints and
Daniel Smith Gum.... (did I get most of the variables????)..... the alcohol
caused a LOT of staining/poor clearing :-(

I did not use Everclear (illegal where I live), but added 2% isopropyl. It
did coat nicely though!

-- 
Tom Ferguson
http://www.ferguson-photo-design.com

> From: Judy Seigel <jseigel@panix.com> > Subject: Re: Gum discovery by S. Melvin -- maybe > > > On Mon, 11 Mar 2002, Richard Sullivan wrote: > >> Stu was beside himself over a discovery he made. At least we have not seen >> a mention of this in print so we think it is his discovery. I asked him if >> he was going to keep it a secret and he said no, that it will be part of >> his workshops. > > This may be a case of parallel invention -- or more precisely > re-invention. It's not common, but does appear from time to time in the > old formulas -- a certain percentage of alcohol added to the mix. The next > time I come across one, I'll post it. But it remains in occasional use, or > was a few years ago, tho perhaps as a cure for a specific coating problem. > > My experience with it makes me suspect it's materials dependent however -- > wonderful with some combos, a dud with others. And, though I don't recall > the subject line, I'm pretty sure we discussed it on this list: I know I > got it somewhere & did NOT invent it. (Al Strauss comes to mind, but > that's simply a guess.) > > I was trying to make gum emulsion hold on a slippery surface (the first > coats were very dense), as apparently it does, or is supposed to. The > alcohol (supposedly, or apparently, take your choice) makes it penetrate > more deeply or better. The risk is that if you put in too much, it > penetrates too deeply & doesn't clear, or clears with much difficulty and > not nicely. Maybe also the quality of the alcohol is a factor -- I used > plain isopropyl <BIG SNIP>


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