RE: temperaprint & foaming

Hmmm

I have been rolling directly onto yupo. Tried rolling onto glass, but was
still getting bubbles. Will try rolling on glass til the roller is dryer.

Thanks :)

Gord

On Mon, 13 Feb 2006, Dave Soemarko wrote:

> Hi Gord,
>
> You did roll to a piece of tile or glass (until the roller was about "dry")
> before rolling to the paper, right? That is, we are not talking about very
> wet rolling. It is almost like rolling the ink for printmaking. The ink is
> not running wet.
>
> I did that and didn't remember having much problem with bubbles.
>
>
> Dave
>
> -----Original Message-----
> From: Gordon J. Holtslander [mailto:holtsg@duke.usask.ca]
> Sent: Monday, February 13, 2006 1:16 PM
> To: alt-photo-process-l@usask.ca
> Subject: temperaprint & foaming
>
> Hi:
>
> I continue to fiddle with tempera printing - still not happy with coating.
>
> I've tried using a brush, roller, and paint pads - but still get a very
> inconsistent coating.
>
> Get the most consistent coating using a roller, but application with a
> roller creates lots of tiny bubbles.
>
> Read that the addition of salt reduces foaming and bubbling. Added a pinch
> of salt to the last tempera mix. It appeared not to foam as much.
>
> I wanted to see what a brush coating would do - no bubbling, and was able to
> put on a very thick coating. So thick that it would not bind to the yupo,
> or the addition of salt prevented proper hardening.
>
> Didn't have time to do a roller coating though.
>
> Read more about antifoaming agents. Looks like Dimethylpolysiloxane is a
> commonly used food grade antifoaming agent. Its seems to be a suspension of
> very fine silicone particles that alter the surface tension so that foam
> bubbles can not form.
>
> Does anyone have experience with any antifoaming agents?
>
> Gord
>
> ---------------------------------------------------------
> Gordon J. Holtslander Dept. of Biology
> holtsg@duke.usask.ca 112 Science Place
> http://duke.usask.ca/~holtsg University of Saskatchewan
> Tel (306) 966-4433 Saskatoon, Saskatchewan
> Fax (306) 966-4461 Canada S7N 5E2
> ---------------------------------------------------------
>
>
>

---------------------------------------------------------
Gordon J. Holtslander Dept. of Biology
holtsg@duke.usask.ca 112 Science Place
http://duke.usask.ca/~holtsg University of Saskatchewan
Tel (306) 966-4433 Saskatoon, Saskatchewan
Fax (306) 966-4461 Canada S7N 5E2
---------------------------------------------------------
Received on Mon Feb 13 13:51:03 2006