U of S | Mailing List Archive | alt-photo-process-l | Re: Gum Calibration 2 (How to read color samples?)

Re: Gum Calibration 2 (How to read color samples?)

Hi Loris,

Maybe but,

All my pigments are diluted 15ml to 150ml paint to gum. Any less and they get very wishy washy (insipid).


On Oct 24 2008, Loris Medici wrote:

David, could it be that the pigment concentration is too much? I think the
problem lays right there. In an article by Sam Wang it was written that he
mixes his color to a saturation and luminosity close to the test patches
found in color newspaper (usually printed somewhere in the bottom or in
the middle of two pages). And I remember Katharine writing something about
this too...


P.S. Going to mix a new batch of gum (from powder) that will be used to
make stock solutions...

I will start with:

1+3 PY151 (15ml paint giving total 60ml stock)
1+5 PV19 Rose (15ml paint -> 90ml stock)
1+7 PB15:3 (15ml paint -> 120ml stock)

and dilute more as necessary.

24 Ekim 2008, Cuma, 9:06 pm tarihinde, davidhatton@totalise.co.uk yazmýþ:
> Hi Loris,
> Your idea sounds good, however it doesn't fit with the instructions
> which come with the product and I haven't tried it. Give it a whirl
> and let us know how it goes. The problem I have with both these pieces of
> software is that, yes you get a good curve for each individual colour and
> yes you will get a fully tonal print from each colour, but when you lay
> one coat upon another all bets are off. The resulting images (IMO) are
> far too dark/dense.
> Good Luck though
> David H