Re: temperaprint & foaming

I think all coating techniques are difficult in the beginning but as we
master a medium we tend to forget this fact. I will always remember how
terrible my first efforts were with a glass rod. If you are using the
correct dilution there should not be too much of a problem. An anti-foaming
agent is not necessary. As Dennis noted you have too much solution on the
paint pad or roller. I always roll off the excess onto a kitchen towel and
use a nice lightly saturated roller and coat with a bit of pressure at
first then gradually going lighter. Dry and expose and then on to the next
coat. I wouldn't worry if your first coats are a bit streaky and uneven.
Press on because this is a very forgiving process and the effects are
created by the combination of colours resulting from the various coatings
rather than a first perfect coat so an imperfection may well disappear after
a couple of coats. Keep going. It will be worth it and good luck. Hellena
----- Original Message -----
From: "dklinker" <d.klinker@ntlworld.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, February 13, 2006 8:44 PM
Subject: Re: temperaprint & foaming

> Gord i think the problem is that you are overloading the roller with
> emulsion and that on the final pass over the yupo with the roller the hand
> should just support the roller but not apply any pressure I am sure that
> Some of our experienced Temperaprinters on this list could supply a
> better.explaination Dennis Klinker
> ----- Original Message -----
> From: "Gordon J. Holtslander" <holtsg@duke.usask.ca>
> To: <alt-photo-process-l@usask.ca>
> Sent: Monday, February 13, 2006 6:15 PM
> 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
> > ---------------------------------------------------------
>
Received on Tue Feb 14 04:16:00 2006