>Message text written by Tom Ferguson
>
>Question #1: The dreaded cyanotype mold attack: Is there anything one can
>do to prevent the "A" solution (25gm Ferric Ammonium Citrate, 0.5gm Oxalic
>acid, water to 100ml) from developing that white "mold" if kept more than
a
>few days?
I have never had an attack of mould on my cyanotype mixtures either when A
& B are mixed together for storage or kept for up to a year. In both cases
the solutions provide goodprints. But I have never added any oxalic acid
to the mixtures.
> I've always assumed that this was an indication to throw it down
>the drain? I also throw the "B" solution (9gm Potassium Ferricyanide,
>0.5gm Oxalic Acid, 0.2gm Ammonium Dichromate, water to 100ml) down the
>drain at the same time.
There does not seem to be any need for the B to be thrown away.
I tend to stick with the old formulas,of which I have about fifty which
purport to be different, but they all say the same thing !
Terry King
<