David Malicky on fri 12 may 00
I'm looking for a Cone 6 Blue formula that is...
- dark but not too close to black
- semi-gloss or glossy
- medium to low expansion
- food safe
- does not crawl (i have a few of these already!)
- has less than 15% Gerstley (so not too goopy)
Thanks,
David Malicky
Valparaiso University
David.Malicky@valpo.edu
http://diamond.gem.valpo.edu/~dmalicky/
Lorraine Pierce on sun 14 may 00
Ian and David...I have also found the Midnight Blue ^6 glaze a beautiful reliable
predictable one. When I tested it with a three day vinigar soak there was no
leaching, but I have not sent it away...I believe it appeared in Pottery Making
magazine a while ago. Lori in new Port Richey Fl...with the AC on again for the
summer!
Ian Macmillan wrote:
> David
>
> No one seems to have answered you on the list, so I am sending this that I
> got from clayart some time ago. I have used it at cone 6 with great
> success. Best fairly thick.
>
> Midnight blue
>
> whiting 17
> ball clay 8
> kaolin 9
> flint 22
> potash feldspar 44
>
> add: cobalt oxide 5% ( I use carbonate 10% )
>
> no gerstley
> doesn't run or craze for me
> lovely deep blue - add more cobalt if you need to
> glossy
> can't speak to the food safe with the cobalt. I don't know if anyone has
> tested it.
>
> Best of luck!
>
> Ian
>
> >----------------------------Original message----------------------------
> >I'm looking for a Cone 6 Blue formula that is...
> >- dark but not too close to black
> >- semi-gloss or glossy
> >- medium to low expansion
> >- food safe
> >- does not crawl (i have a few of these already!)
> >- has less than 15% Gerstley (so not too goopy)
> >
> >Thanks,
> >David Malicky
> >Valparaiso University
> >David.Malicky@valpo.edu
> >http://diamond.gem.valpo.edu/~dmalicky/
>
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Ian Macmillan on sun 14 may 00
David
No one seems to have answered you on the list, so I am sending this that I
got from clayart some time ago. I have used it at cone 6 with great
success. Best fairly thick.
Midnight blue
whiting 17
ball clay 8
kaolin 9
flint 22
potash feldspar 44
add: cobalt oxide 5% ( I use carbonate 10% )
no gerstley
doesn't run or craze for me
lovely deep blue - add more cobalt if you need to
glossy
can't speak to the food safe with the cobalt. I don't know if anyone has
tested it.
Best of luck!
Ian
>----------------------------Original message----------------------------
>I'm looking for a Cone 6 Blue formula that is...
>- dark but not too close to black
>- semi-gloss or glossy
>- medium to low expansion
>- food safe
>- does not crawl (i have a few of these already!)
>- has less than 15% Gerstley (so not too goopy)
>
>Thanks,
>David Malicky
>Valparaiso University
>David.Malicky@valpo.edu
>http://diamond.gem.valpo.edu/~dmalicky/
Ron Roy on thu 25 may 00
Hi Ian,
This is interesting - it's really at least a cone 10 glaze without the
cobalt because it has lots of alumina and silica. The cobalt - way over any
limits recommended for food by the way - is acting as a flux.
This would be an excellent glaze to have tested at Alfred - way over in
limits but it just might be food safe because of it.
Anybody want to be a hero?
RR
>No one seems to have answered you on the list, so I am sending this that I
>got from clayart some time ago. I have used it at cone 6 with great
>success. Best fairly thick.
>
>
>Midnight blue
>
>whiting 17
>ball clay 8
>kaolin 9
>flint 22
>potash feldspar 44
>
>add: cobalt oxide 5% ( I use carbonate 10% )
>
>no gerstley
>doesn't run or craze for me
>lovely deep blue - add more cobalt if you need to
>glossy
>can't speak to the food safe with the cobalt. I don't know if anyone has
>tested it.
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
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