Paul Lewing on thu 11 jun 98
I've recently been trying to develop some new shades of grey glazes
(cone 5 oxidation). I've got one using a no-chrome grey stain, one
that's grey from Mt St Helens ash, and one that's a grey-green that's
half commercial opaque white glaze and half scrap. But if you paint
Northwest landscapes using glazes, you need lots of shades of grey.
Here's my problem: in all the base glazes I normally use, all the
chrome-bearing grey stains turn out various shades of pink to purple.
Nice colors, but not grey. None of these glazes have tin (or any
other opacifier) nor do they have zinc. They mostly have alkaline
earths and some boron. There's some chrome in other glazes in the
same firings, but not much. So why are they turning pink? Does
anybody have a base glaze in which they do not turn pink?
Thanks,
Paul Lewing, Seattle
Don MacDonald on fri 19 jun 98
I have noticed that if a white glaze contains either rutile or titanium
that pink flashing may occur.
On an another topic - your recent reply to Jay on the art vs craft
discussion was the best "strictly for the birds" I've seen for a long
time!
June MacDonald
Paul Lewing wrote:
>
> ----------------------------Original message----------------------------
> I've recently been trying to develop some new shades of grey glazes
> (cone 5 oxidation). I've got one using a no-chrome grey stain, one
> that's grey from Mt St Helens ash, and one that's a grey-green that's
> half commercial opaque white glaze and half scrap. But if you paint
> Northwest landscapes using glazes, you need lots of shades of grey.
>
> Here's my problem: in all the base glazes I normally use, all the
> chrome-bearing grey stains turn out various shades of pink to purple.
> Nice colors, but not grey. None of these glazes have tin (or any
> other opacifier) nor do they have zinc. They mostly have alkaline
> earths and some boron. There's some chrome in other glazes in the
> same firings, but not much. So why are they turning pink? Does
> anybody have a base glaze in which they do not turn pink?
>
> Thanks,
> Paul Lewing, Seattle
Linda Blossom on tue 18 aug 98
Hi Paul,
I have been cleaning out the inbox and found your post about greys that I =
had
saved. It takes me forever since the computer is no where near the glaze =
book.
Do you have Greg Daly's book? S62 is a nice blue gray. The base is F in =
his
book: neph sy 36, whiting 9, barium carb 9, 3124 9, talc 4, silica 28, epk =
5.
For 62 add .5 cobalt carb and 8 rutile. I use US Pigments rutile which is =
paint
grade with a low low amount of iron.
Rob's Clear is a glaze that gives good colors - I may have tried it with =
Neutral
Gray (or is the name Neutral Blue?) I just shortened its name to neutral.
Anyway, this base gives good clear colors with blues, greens, reds and =
oranges.
I use the rose red (actually closer to a cadmium red) from US Pigment as =
well as
their orange stain. The base is whiting 15, 3195 20, f-4 40, epk 10, silica=
15,
bentonite 1.5. I use veegum instead of the bentonite. I haven't tried the
stain silver in this base ( at least I can't find a sample - thanks to the
inferior off brand velcro stuff, samples have been falling down and getting
lost).
The stain soft green gives a light greenish gray in this base: 20=25 each:
silica, epk, whiting, 3134, neph sy. Despite what the software says, this =
is a
gloss glaze at cone 6. The stain silver turns burgundy in this base. It =
has
good green, blue, yellow, red, and brown colors almost identical to the =
Rob's
Clear.
Kenney's engobe is vitreous and grays do well in it. It works well over =
many
glazes for accents. I add superpax as needed. It is epk 6, tenn 10 or om-4 =
6,
custer or g-200 10, silica 20, whiting 3, borax 3, neph sy 12, 3124 20.
Just for fun, this glaze after firing, takes watercolor well: Dry =
Sandstone:
Barium carb 24, dolomite 24, neph sy 24, epk 17, silica 11. I also trail and
brush the Kenny engobe onto it prior to firing.
I single fire all of these to cone 6. Don't do any spell checking=21=21=21
Linda Blossom
2366 Slaterville Rd.
Ithaca, NY 14850
6075397912
www.artscape.com
blossom=40lightlink.com
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