[pure-silver] Re: Paraformaldehyde/Acetone in lith developers
- From: BILL WILLIAMS <krbill_10@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 1 Mar 2010 19:44:43 -0800 (PST)
Kodak Super RT has Sodium Formaldehyde Bisulfite, according to the MSDS. The
dry form of sodium formaldehyde bisulfite can be found as the (I believe) only
ingredient in ClorAmX which is use to remove clorine and ammonia from aquarium
water. The wet form is Amquel, used for the same purpose. I use the Amquel, as
I don't do a lot of lith printing, and liquid is handier for me. I believe
that 20 ml of Amquel is equivalent to 5 grams of the dry sodium formaldehyde
bisulfite.
I find the odor of the 'SFB' is not irritating as is that of acetone. That is,
I can always smell the acetone, but not the sodium formaldehyde bisulfite. I
also have on hand formalin, which I sometimes use. It too has an ordor, but
again, it is not as irritating to me as is acetone. And, acetone is flammable.
You can order quite a bit of the sodium formaldehyde bisulfite in bulk for 50
or so dollars.
--- On Mon, 3/1/10, Jean-David Beyer <jeandavid8@xxxxxxxxxxx> wrote:
> From: Jean-David Beyer <jeandavid8@xxxxxxxxxxx>
> Subject: [pure-silver] Re: Paraformaldehyde/Acetone in lith developers
> To: pure-silver@xxxxxxxxxxxxx
> Date: Monday, March 1, 2010, 9:04 PM
> Richard Knoppow wrote:
>
> > I presume the dollar a print
> development cost is for a commerially prepared developer.
> Have you calculated the cost of home mixed stuff? It is
> possible that it could be significantly cheaper. If, as Tim
> Rudman states, acetone CAN be used in a lith developer it
> should help. Acetone is available at any paint or hardware
> store and is very cheap. Probably pure enough for the
> purpose. The developer would probably have to be mixed as
> needed but there may be some way of making up a stock
> solution minus the acetone which would be more convenient.
> > I no longer remember what
> Kodak has/had in their commercial lith developer but I do
> remember that it did not seem to be D-85. There may be yet
> another alternative to formaldehyde or acetone.
> >
> MSDS for Kodalith Super-RT developer. Pretty much the same
> as the regular stuff, I believe.
>
> http://www.google.com/url?sa=t&source=web&ct=res&cd=6&ved=0CCAQFjAF&url=http%3A%2F%2Fwww2.itap.purduhttp://www.google.com/url?sa=t&source=web&ct=res&cd=6&ved=0CCAQFjAF&url=http%3A%2F%2Fwww2.itap.purdue.edu%2Fmsds%2Fdocs%2F9679.pdf&rct=j&q=kodalith+developer&ei=wm6MS7jYA8aPtgfaiv2_Ag&usg=AFQjCNFybcCixP4ZITaqXxoduc8Uo3OpfAe.edu%2Fmsds%2Fdocs%2F9679.pdf&rct=j&q=kodalith+developer&ei=wm6MS7jYA8aPtgfaiv2_Ag&usg=AFQjCNFybcCixP4ZITaqXxoduc8Uo3OpfA
>
>
> -- .~. Jean-David Beyer
> Registered Linux User 85642.
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