Alisa Liskin Clausen on fri 17 mar 06
Photos of opacity tests are at:
http://pg.photos.yahoo.com/ph/alisapots/my_photos
or you can go to
www.alisapots.dk
glaze tests
see more tests
and they will be in the album called opacity tests.
Regards from Alisa in Denmark
Steve Slatin on sun 19 mar 06
All this sturm und drang about personalities and
no one has commented on these tests. Alisa has a
wonderful organized approach to testing, and if
you're interested in the opacity of different
base glazes, these samples are a great place to
start. And the photos are good, so you can also
evaluate the effects of the different oxide
underglazes (overglazes?) used on the test tiles.
Thanks, Alisa, for another great series of
informative tests.
-- Steve S
--- Alisa Liskin Clausen
wrote:
> Photos of opacity tests are at:
>
>
>
http://pg.photos.yahoo.com/ph/alisapots/my_photos
>
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May Luk on mon 20 mar 06
Hello Alisa;
Thanks for the photos. Those tests are good
inspirations. I thought I was over pink specks with my
test. We were looking for pink specks in matte glaze.
It was a limited exercise. Your tests intrigue me. Now
I want to see for myself pink specks on glossy glaze!
Are you going to do more study with the cobalt wash? I
wonder what's the difference between high
concentration cobalt wash Vs high concentration
distribution in the glaze slope.
If you are doing more cobalt pinky test, can I send
you some cobalt from here? There will be one more
sample quality to compare.
I'm going to do some independent study over here.
Maybe we can match notes later.
I like the 'yarny' cobalt brush stroke in the 50frit
J/30Si/20EPK/Z combo.
Many thanks and warmest regards
May
London, UK
Linda Ferzoco on mon 20 mar 06
Steve,
I always look at Alisa's tests, but I couldn't locate
the newest ones. Which set are they on the page cited
below?
> http://pg.photos.yahoo.com/ph/alisapots/my_photos
--- Steve Slatin wrote:
> All this sturm und drang about personalities and
> no one has commented on these tests.
Alisa Liskin Clausen on mon 20 mar 06
Hi Steve,
Glad that you looked at the tests, thanks.
Hi Linda,
Glaze tests are in the album called opacity.
Hi May,
I think Steve has an idea that makes sense for these pink crystals. His
chunky Rutile gave me the idea that the specs came from the lumpiness of
my wash. I disolved Cobalt Ox. in water and mixed it with a brush. I used
the same brush to paint the wash under the glaze tests. I think the
clumps and lumps, small, but visible, could be the reason for these
crystals. Oversaturation of Cobalt gives black and the glaze will pull
away from it. On my tests, I can see crystals visible only on the darkest
(thickest and clumpy) parts of the brush stroke.
Additionally, the glaze bases are all quite different, with the addition
of Zircopax. I have not seen these crystals in the 20 x 5 glaze with
Zircopax added, which I use a lot, when I have painted strokes of thinner
Cobalt wash made from Cobalt carb. I had also, just received new Cobalt
Oxide when I made these tests and used the oxide for these tests. So,
there are a few variables that I would have to keep testing to try to
pinpoint the cause of these unexpected and lucky pink crystals. Could
just be as Ivor suggests, the batch of Cobalt. But I have the feeling
that Steve has the idea that I will persue in further tests, the texture
of the wash.
The yarny stripe as you call it, is made with an ear syringe and it is
underglaze.
Regards from Alisa in Denmark
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