Steve Slatin on tue 2 aug 05
Veena, Jon and any other interested parties --
I put some tests in my most recent glaze firing to get
more background on the rutile issue. As usual, I now
have suggestions for even more testing, but this is
what I have so far, all at ^6 oxidation, all initially
glazed with MC6G "Glossy Clear Liner Glaze" over
white stoneware (Seattle Pottery supply's 'Sea Mix 5')
and overglazed with a wash of frit 3134 and --
Titanium Dioxide
20% Shows opacity where thicker, but not a solid
pattern
33% Shows opacity throughout and a visible but
faint yellowing where thicker, starts to show
the distinctive "fireworks display" pattern,
somewhat glossier than base glaze alone
43% Definite opacity, more yellow in some thick
areas, fireworks display pattern not evident
more matte than base glaze alone
50% Essentially identical to 43% concentration
Well, the Ti alone isn't giving us the rutile effect.
Next test, RIO
20% Slight opacity, somewhat glossier than base
glaze alone, a little bit of brown in one spot
33% As #1 but hints of toast where thick; one thick
spot quite tan/toast
43% Tan/toast color becoming very strong, less
glossy than base glaze alone
50% Tan, opaque, rather matte
Third test, Rutile (Milled, I believe)
20% Slightly glossier than the base glaze, darker
than the base glaze but the color is so
neutral as to defy description -- sort of
a bleached out kakhi?
33% Glossier than the base glaze, shows
characteristic "fireworks" pattern, pale to
deep browns, golden squarish crystals where
thick, some brown specks suspended in
glaze, glossier than #1
43% As above, but it seems glossier, thicker,
and there is more dark brown and denser
crystals. Fireworks pronounced.
50% More and larger crystals, a dark brown patch
that's rather matte in the middle of the
gloss where the overglaze is thickest.
Fireworks riotous, even where crystals don't
appear.
It appears that the 3134 is providing a lot of what we
want here, even when concentrations of colorant are
low it gives a little patterning and opacity to the
base glaze. RIO and 3134 alone just give that
tan/toast color, and as the RIO rises the patterning
disappears. Next glaze load I'll try to mix some RIO
and Ti and 3134 together to see if I can get something
with the gold flecks in it. If not, I'll try to come
by some Ti or Fe that's more granular and see if
that's what the key element is.
Steve Slatin --
Drove downtown in the rain
9:30 on a Tuesday night
Just to check out the
Late night record shop
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Ron Roy on wed 3 aug 05
Good stuff Steve - I like your style.
RR
>Veena, Jon and any other interested parties --
>
>I put some tests in my most recent glaze firing to get
>more background on the rutile issue. As usual, I now
>have suggestions for even more testing, but this is
>what I have so far, all at ^6 oxidation, all initially
>glazed with MC6G "Glossy Clear Liner Glaze" over
>white stoneware (Seattle Pottery supply's 'Sea Mix 5')
>and overglazed with a wash of frit 3134 and --
>
>
>Titanium Dioxide
>
>20% Shows opacity where thicker, but not a solid
> pattern
>
>33% Shows opacity throughout and a visible but
> faint yellowing where thicker, starts to show
> the distinctive "fireworks display" pattern,
> somewhat glossier than base glaze alone
>
>43% Definite opacity, more yellow in some thick
> areas, fireworks display pattern not evident
> more matte than base glaze alone
>
>50% Essentially identical to 43% concentration
>
>Well, the Ti alone isn't giving us the rutile effect.
>
>Next test, RIO
>
>20% Slight opacity, somewhat glossier than base
> glaze alone, a little bit of brown in one spot
>
>33% As #1 but hints of toast where thick; one thick
> spot quite tan/toast
>
>43% Tan/toast color becoming very strong, less
> glossy than base glaze alone
>
>50% Tan, opaque, rather matte
>
>Third test, Rutile (Milled, I believe)
>
>20% Slightly glossier than the base glaze, darker
> than the base glaze but the color is so
> neutral as to defy description -- sort of
> a bleached out kakhi?
>
>33% Glossier than the base glaze, shows
> characteristic "fireworks" pattern, pale to
> deep browns, golden squarish crystals where
> thick, some brown specks suspended in
> glaze, glossier than #1
>
>43% As above, but it seems glossier, thicker,
> and there is more dark brown and denser
> crystals. Fireworks pronounced.
>
>50% More and larger crystals, a dark brown patch
> that's rather matte in the middle of the
> gloss where the overglaze is thickest.
> Fireworks riotous, even where crystals don't
> appear.
>
>It appears that the 3134 is providing a lot of what we
>want here, even when concentrations of colorant are
>low it gives a little patterning and opacity to the
>base glaze. RIO and 3134 alone just give that
>tan/toast color, and as the RIO rises the patterning
>disappears. Next glaze load I'll try to mix some RIO
>and Ti and 3134 together to see if I can get something
>with the gold flecks in it. If not, I'll try to come
>by some Ti or Fe that's more granular and see if
>that's what the key element is.
>
>
>Steve Slatin --
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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