From: TERRY KING, 101522,2625
TO: Judy Seigel, INTERNET:jseigel@panix.com
DATE: 04/06/96 10:16
RE: Copy of: Re: Copy of: Re: Copy of: buying Gum Arabic
Judy
Honest Miss ! It wasn't me.
> On Mon, 3 Jun 1996, TERRY KING, ( IN FACT IT WAS PETE WHO)<
Yes it was me pete, stop grovelling Terry she's is not that frighting,!
I> asked Pete why he would want to do it more than once. He said that if you did
there would be a stain.<
each time you sensitise a gum layer with Dichromate and expose it you
create a layer of exposed colloid, which exhibits Dichromate stain,
> > It isn't clear to me why you couldn't *clear* this Dichromate stain
> before starting to print, as I have done, with no bad effects that I
> could detect.<
You can not ever clear Dichromate stain ! { statement}
You cant get rid of this layer all you can do is minimise it, bisulphite
and meta bisulphite will change the brown stain to a lovely blue green grey
a kind of dove grey, if you use my recommended 1% sol sulphuric acid then
the Dichromate stain will change to a neutral grey, but it is still there,
however slight.
That is what I suggested in the first place and that is what I do.[ what
you suggested is my old friend incorrect}
pete
Terry