Carole Fox on sat 3 jun 06
I was planning to use underglazes (Amaco Velvet Series) to decorate some
pieces that will be raku fired with a clear glaze. I plan to apply the
underglaze to greenware and bisque fire it on. In the archives, I found
some posts from people who had trouble with underglaze colors disappearing
when used in raku, along with recommendations to use a thicker coat of
underglaze to prevent the color from being absorbed into the glaze layer.
This makes sense to me.
If any of you have experience in using underglazes for raku, I would
appreciate any additional tips you could share regarding application of
the underglaze, colors that work well, etc.
Thanks in advance,
Carole Fox
Dayton, OH
Barbara Francis on sun 4 jun 06
Hi Carole, I did a Raku firing friday night and tried one piece with stroke and coat candy apple red, just to see what happens. It turned a bright red, no crackle or anything which disappointed me. I didn't put a clear on it at all.
Barb Francis
Carole Fox wrote:
I was planning to use underglazes (Amaco Velvet Series) to decorate some
pieces that will be raku fired with a clear glaze. I plan to apply the
underglaze to greenware and bisque fire it on. In the archives, I found
some posts from people who had trouble with underglaze colors disappearing
when used in raku, along with recommendations to use a thicker coat of
underglaze to prevent the color from being absorbed into the glaze layer.
This makes sense to me.
If any of you have experience in using underglazes for raku, I would
appreciate any additional tips you could share regarding application of
the underglaze, colors that work well, etc.
Thanks in advance,
Carole Fox
Dayton, OH
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Elizabeth Priddy on sun 4 jun 06
In my experience, they will disappear in any reduction
atmosphere. I have done gas cone 11, and raku cone 05
and it is the atmosphere not the heat that "takes" the
hues away.
Elizabeth Priddy
Beaufort, NC - USA
http://www.elizabethpriddy.com
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Graham Mercer on mon 5 jun 06
Hi Carole,
In your post you asked "If any of you have experience in using underglazes
for raku, I would appreciate any additional tips you could share regarding
application of the underglaze, colors that work well, etc."
I have used underglaze with the raku process in the past with good results.
Look at the first and fourth images on the second row, and first image on
the third row of my raku gallery for examples.
http://grahammercer.com.au/gallery-pages/raku%20gallery/raku%20gallery.html
I mix the underglaze colour with some kaolin and water, then spray this
mixture onto the greenware pots and bisque them. I then apply a coat of
clear crackle glaze and do the normal raku firing and reduction process. I
have not had any problems with colour fading or absorbing using this
process.
For information the clear crackle glaze that I use is
Ferro Frit 4108 60% (this is an Australian frit number for a Calcium
borosilicate frit - Raku special effects)
Nepheline Syenite 30%
Ball Clay 10%
It is ideal over slip or underglaze, producing bold primary crackle in the
reduction bin. Secondary crackle appears when the pot is cleaned, no further
staining is usually required.
Hope this helps,
Graham
Graham Mercer
Potters Online
http://pottersonline.com.au
(03) 9844 2765
0411 097 259
Skype ID graham.mercer
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