RE: First Tricolor Gum (on aluminum)
Hi Loris, Nicely done. Much better than my first gum print. :) I have a friend that did a series of gum prints on copper plates a while back. He mixed some pumice powder into his gelatin for tooth and managed to get up to 15 layers printed. Camden Hardy camden[at]hardyphotography[dot]net http://www.hardyphotography.net On Mon, December 11, 2006 8:27 am, Loris Medici wrote: > My understanding also is the same, CaCO3 gives a gritty/toothy surface. > Probably matte acrylic gesso also contains considerable amnt. of CaCO3 > both as a colorant and as a surface tooth agent. Since I learned this > from Keith and I also know that he may put 6 - 7 layers on top of each > other, I'd say this kind of surface priming is pretty robust. The layer > order is Cyan, Magenta and Yellow... (Black is missing - didn't bother > since the M layer was unregistered, I just wanted to see how colors > interact with each other.) > > Regards, > Loris. > > -----Original Message----- > From: Katharine Thayer [mailto:kthayer@pacifier.com] > Sent: 11 Aralęk 2006 Pazartesi 17:07 > To: alt-photo-process-l@usask.ca > Subject: Re: First Tricolor Gum (on aluminum) > > ... > > The calcium carbonate, I take it, is for "traction" to give the gum > something to hang onto, much like the fine sand I use in acrylic for > the same purpose on hard surfaces. I find that it doesn't always > hold three layers; sometimes it will, but sometimes the top one will > only hold in areas where there aren't already two layers of gum. And > sometimes the top layer will stick to the other two layers and then > all three layers pull off the surface together. So I'd say you did > quite well on your first attempt. Which was your last layer, the > yellow or the magenta? > > I suppose in a way this could be seen as a variation on the gelatin/ > gesso thing. It's interesting to watch how ideas spread and mutate. > Katharine > >
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