search  current discussion  categories  materials - misc 

glaze test for colemanite sub for gb in floating blue

updated sat 23 sep 00

 

Alisa and Claus Clausen on fri 22 sep 00


Tested on light grey mid range stoneware fired to 1220c oxidation.

Receipe
47,3 Neph. Sye
27,0 Gerstley Borate
20,3 Flint
5,4 Kaolin

Add
ROI 2,0
Colb. Oxide 1,0
Rutile 4,0
Bentonite 2,0

All ingredients were measured up to next highest whole decimal.

Colmanite was subbed for Gerstley Borate.

The initial test shows an overall shiny, brownish test bowl, with (that) =
a greenish pool in center. However, there are spots with floating blue =
throughout,
and especially on the thinner edges. This could be working, but I am =
going to test this on a bigger bowl.

Best regards,
Alisa