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

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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
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Received on Mon Feb 13 13:07:27 2006