>Don't know if this will help or not, but a while back I was sent a piece of
>Hanfstaengl carbon tissue so I could see what it looked like. Out of
curiosity,
>I measured the coating thickness, and found it to be about 0.002 inches (0.05
>mm) thick. I coated two 8x10 sheets with 100ml of gelatin, and ended up with a
>film thickness of about 0.0025 inches (0.064 mm). My coating process was
fairly
>sloppy, so it definitely took less than 50ml to coat one 8x10. These coating
>thicknesses were for the dry gelatin. I don't know how much the gelatin
shrinks
>as it dries.
>
>One the other hand, unless you are trying to conserve pigmented gelatin,
thicker
>layers shouldn't hurt anything. You just need to have a sufficiently thick
>coating so that the light hardening doesn't penetrate all the way through
to the
>tissue support. The excess gelatin is washed away during development.
>
Thanks Wade,
Thats exactly what I found. Which means that when poured, the wet gelatin
can be under 1 mm in thickness. You are right that heavier can't hurt. You
just end up leaving more on the tissue after transfer, which gets thrown away.
But this is of importance from a financial standpoint, especially if using
tube watercolors for pigment.
Cheers
Al