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crystals- food safe? leachs

updated thu 16 may 02

 

Ababi on wed 15 may 02


I tested a broken piece. (A piece of a piece)
Half way in vinegar. 72 hours. Some parts of the deepen part faded . I
uploaded to my Crystal Glazes Page, kind of hard to see. Downside left
faded , according to the part it took in the crystal glaze appearance.
( "flowers" or background.)

It was a ^6 glaze Found in Lana Wilson's inspiring book:

BASE ONE CR.2-JENE RICHTER
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

Cone 6 1201 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

FRIT 3110 49.40
ZINC OXIDE 26.20
ENGLISH KAOLIN CC31 1.40
SILICA 17.20
Titanium Dioxide 5.70
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

Seger Weight%
KNO 0.264 8.70%
CaO 0.109 3.10%
MgO 0.000 0.00%
ZnO 0.627 25.89%
Al2O3 0.045 2.32%
B2O3 0.036 1.27%
SiO2 1.695 51.67%
TiO2 0.174 7.05%
K2O 0.025 1.17%
Na2O 0.239 7.52%
Al:Si 37.70
Expan. 9.49
ST 344.73


I do not remember how much copper oxide was there between 4-6%

Ababi Sharon
Kibbutz Shoval- Israel
Glaze addict
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm




---------- Original Message ----------

>Hi, Jocelyn and all,

>Re: leaching, I've never tried a commercial test, but after
>cooking lemon juice and vinegar in a microwave for 15 minutes
>(not the same plate) I noticed no difference, even after the
>whole sat overnight. This is probably, strickly speaking, not
>a valid test but then again, so don't anyone flame me.


>Fa
>--
>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>Fara Shimbo, Certified Public Nuisance, Master Crystallier
> Shimbo Pottery, Hygiene, Colorado, USA
> crystalline-ceramics.info ++ shimbopottery.com
>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>"It's great to be known. It's even better to be known
> as 'strange.'" -- Kaga Takeshi