U of S | Mailing List Archive | alt-photo-process-l | Re: First print on Al

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

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?


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 yazmı�:
>>> 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