Re: 3rd layer of gum
Thanks for your reply.
This happens whether the paper is sized or not. Yesterday I did a tricolor on Fabriano EW unsized in blue, red, yellow order (my usual order is yellow, red, blue) and the yellow (3rd) layer had just a little effect on the outcome and was developed in 15 min as opposed to the other layers at 30 min.
When I print Y, R, B the same thing happens on the last layer (B).
It always looks like the last layer needs another exposure of that particular color.
----- Original Message -----
From: "Katharine Thayer" <firstname.lastname@example.org>
Sent: Wednesday, October 07, 2009 9:30 AM
Subject: Re: 3rd layer of gum
> Paul, I've only seen this with nonabsorbent surfaces like glass and
> yupo, and only in areas where there are actually three layers of
> hardened gum. (for instance if there's an area that's all blue, where
> little or no yellow or red pigment have been deposited, there's no
> problem with adherence of the third (blue) layer, only in more
> neutral and mixed areas where there are equal amounts of all gum
> layers. I've never seen it with paper.
> As Keith said, you can adjust for it either by exposing more or
> developing less. I also wonder about your sizing; it sounds like
> maybe your sizing isn't leaving enough tooth for all the layers of
> the gum to have some to hold onto.
> On Oct 6, 2009, at 1:18 PM, Paul Viapiano wrote:
>> Hi all...
>> Why does the 3rd layer of a gum print always develop so quickly, or
>> is subject to washing off so much more quickly than the other
>> layers, whether with sized paper or not...? (regardless of printing
>> order, as well...and these are all the same exposure time, too)
>> This has happened on several tricolors I've done now...