Re: First print on Al
Hi Rajul, A new observation by my side: yesterday, I prepared a new sheet using another brand (Talens) of acrylic ground and ta-da!... I got those water bubbles too. It seems something related to acrylic gesso brand/formulation. The one which didn't give me problems was Daler Rowney's System 3 (not Cryla!) Acrylic Gesso. If I get it correctly, System 3 is the student grade product group from Daler Rowney. BTW, I sanded the surface with 180 then 600 grade sand paper and it's really ultra smooth one -> I'll see how it prints tonight (or tomorrow night). Keith also mentioned water bubbles and he uses Liquitex if I'm not mistaking. Try to find Daler Rowney System 3 Acrylic Gesso. Can you please elaborate more about color merging? Regards, Loris. 22 Mart 2009, Pazar, 6:24 pm tarihinde, Rajul yazmış: > Loris and Keith. > > The gesso I used was Stevenson's acrylic gesso. If this is the > problem, I will switch to Liquitex. > Will try a thinner mix and see if pumice instead of CaCO3 will > diminish the super-white. > I have still to find a source for pumice locally - Keith, where did > you get yours from? > > The uneven gelatin spread does not seem to translate into any > observable discrepancies. > However, the colors do not merge between passes as they do on a paper > medium. So one has to pre-mix color combos to get desired effects. > I add everclear along with HCHO before spreading. > Will use a roller instead of a brush. > > The Al plates were discards from a printing house. The new batch I > have is thinner than the previous one and I will make doubly sure > that they are squeaky clean before priming them. > > Many thanks! Rajul > > Once again, Thank you. Rajul > > On 20-Mar-09, at 12:47 AM, Loris Medici wrote: > >> Yes, I feel got a hold on it with this trial -> I'm very excited >> about the >> next ones... (Have to fiddle-a-little with the negative first.) >> >> Adulterant: Calcium Carbonate - since it isn't supposed to be >> there... (At >> that concentration.) >> >> I don't get this bubble thing, I haven't experienced something like >> that. >> Are you using the same acrylic ground as Keith? (Liquitex.) >> >> Try to decrease gelatin strength + add some rubbing alcohol just >> before >> application. Maybe it's too strong and sets before you finish >> brushing??? >> >> Regards, >> Loris. >> >> >> 20 Mart 2009, Cuma, 12:54 am tarihinde, Rajul yazmıÅ�: >>> >>> LORIS - It must feel good that the first print is done. >>> >>> What is adulterated gesso? What color does the adulterant impart to >>> the ground? >>> >>> After 2 gum passes, the first of my prints cracked in one spot, and >>> small water bubbles are still visible. Perhaps they will be less so >>> after further passes. The texture of the brush-applied ground and >>> brush strokes from the gum emulsion actually seem to lend a different >>> kind of interest to the print. >>> >>> Application of a 4% formalin-hardened gelatin was uneven (unlike that >>> on paper media) but this is not very obvious in the print-in- >>> progress. >>> >>> KEITH - can you provide the composition of the thinner gesso mix you >>> use and how many layers of it do you apply? How many gum passes does >>> your gessoed Al allow for? >>> >>> JUDY - the gesso-gelatin size seems interesting but the difficulty in >>> using it with Al sheets seems to lie in keeping the size molten >>> through the application of multiple coats of it with a roller. >>> >>> Thanks for sharing your experiences. Rajul >>> >> >> > >
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