Re: temperaprint & foaming

Gord

It sounds to me that as Dennis said, that there is to much in the roller.
Getting the roller correctly loaded is the first part to getting a correct
coat.

A easy way that I would recommend is to use a 1" brush and paint the
emulsion on to the Yupo first and then use a dry clean roller to smooth the
coat. Roll with a little pressure and let up on that pressure as you go
continue rolling. Go slow and deliberate when you start and light and fast
when you finish. Roll in one direction only when you start.

The other way is to load the roller evenly using a sheet of glass, as Dave
Soemarko said, and roll until the there is just sufficient on the roller.
When rolling on to a print that is A3 Super size the first pass along the
long dimension should be a bit heavy. the second about right and the third
should be a bit light using the same pressure These passes should be done
with a deliberate hand and in successive stripes. The next set of passes
done in the opposite direction is done with a slightly lighter hand and
pulls the heavy strip over the light one. this will give you a generally
even coat. Keep alternating direction and roll methodically, roll in one
direction only and lighten your touch as you go till the roller is just
skimming the surface and is moving much faster than when you first started.
Towards the end of the coating rolling in both directions helps to smooth it
down

Done like his foaming isn't an issue. The Temperaprint is built up in layers
that are thin. Its all a matter of technique, or the "knack", rather than
science

Alex
----------
>From: "Gordon J. Holtslander" <holtsg@duke.usask.ca>
>To: alt-photo-process-l@sask.usask.ca
>Subject: RE: temperaprint & foaming
>Date: Mon, Feb 13, 2006, 7:49 PM
>

> 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 Tue Feb 14 05:18:08 2006