R626 Black with brown or blue dots.

A very good glaze that I have worked with a lot last winter. Apply rather thick. Works well in oxidation an then gives a semi transparent to opaque glaze with a lot of blue. In reduction it gives a more opaque glaze. You can use it on white porcelain to dark brown stoneware clays. On brown clays it must be very thick to give blue patches.
 
glaze R626, small bowl
potash feldspar NR 38,57
whiting 5,71
barium carbonate 8,57
talc 2,86
ball clay 302 8,57
quartz 22,87
ilmenite 7,14
zinc oxide 5,71


R615, a variation of R626

glaze R615, small bowl
potash feldspar NR 39,71
whiting 5,88
barium carbonate 8,82
talc 3,53
ball clay 302 14,71
quartz 14,71
ilmenite 7,35
zinc oxide 5,29