Marcia Selsor on mon 15 may 00
This original had Barium. We switched to a Barium frit 3249. It also has manganese.
This is for reduction. It runs when thick. It is a drak blue and pools
light blue. (It can really make a mess when students go for the thick
with the lighter blue on the outside.
Original from a student (?) Adjusted for frit
Barium Carb 6.5 Barium Frit 3.44
gerstlet Borate 20.95 Ger. Bor. 20.95
Whiting 15.5 Whiting 15.5
Custer Feldspar 44.79 Custer 44.79
EPK 1.03 EPK 1.03
Flint 25.18 Silica 20.18* reduced for frit
Zinc Oxide 3.30 Zinc Ox. 3.30
MN Diox. 2.48 Mn Diox 2.48
Red Iron Ox 2.55 Red Iron Ox. 2.55
Cobalt Carb. 3.10 Cobalt Carb. 3.10
Lorraine Pierce wrote:
> 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
> 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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