Kate and others,
I am trying to remember ealier posts, wasn't there a post that stated that a
more diluted silution of dichromate gave more contrast and thus a lower range
of tones?
Pardon my bad memory.
Mark Nelson
In a message dated 12/14/03 3:28:41 PM, kateb@paradise.net.nz writes:
>
> Hi all, I have just done a little series of tests to look at the difference
> between saturated amm. di. solution and the same solution at 50% strength
> (which I imagine is 15% - but what would I know, I'm no chemist). The results
> were very obvious - the half-strength solution gave a much wider range of tones
> than the full strength with both the Winsor and Newton bottled gum and the
> "generic"gum I mix myself from powder ("borrowed" from the printmaking
> dept). I also threw in a bottled "gum" used by school kids for generations - this
> gave better results with the full strength solution. Interesting! All on Arches
> Aquarelle paper, tray sized with gelatine+ formaldehyde. The "gum"might be
> similar to Gloy but I have no idea what its constituents are - it tastes quite
> organic. Strange to say, I never tasted it when I was a child - how I am
> deteriorating!
>
>
>
> Kate Mahoney
>
>
Received on Sun Dec 14 15:42:27 2003
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