Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Fri, 26 Nov 1999 15:52:56 -0500
Judy Seigel wrote:
>
> What gum and carbon have in common is that the hardening agent is a
> dichromate and the color is (often) pigment. The differences are
> everything else, including that gum arabic and gelatin are entirely
> different animals, so to speak. However, if anyone is removing unexposed
> pigment from *underneath* in gum, I hope they'll share...
Yes, gelatin is very different from gum. Sorry to confuse them.
But on the point of removing material, I thought that the exposed
portions were those hardened, while those not exposed were subsequently
removed. In the case on regular Gum this would be the underlying
material, unless the Gum was transferred, in which case the unexposed
(unhardened) portions would then be on the surface. Is not Gum more
resilient to "flaking" than gelatin, facilitating a good print without a
transfer?
With gelatin I had thought that it was difficult to remove the unexposed
portions without a transfer because of a great amount of "flaking" of
the exposed layer that would occur.
Having not much experience with either of these processes, I would
certainly appreciate being informed. As to Dave's process, I have no
idea at all as to what he has done because he has not indicated so
(neither on his site or otherwise).
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
This archive was generated by hypermail 2.0b3 on Sun Dec 05 1999 - 17:09:24