Cone 6
Can be a very intense blue.

36.0 – Nepheline Syenite

13.0 – Wollastonite

10.0 – Zinc Oxide

10.0 – EPK

31.0 – Silica

100 – Total

Then Add:

1.0 Cobalt Carbonate

6.0 Rutille

Are all of the silicas 325? I don't want to keep asking in every recipe. Also at my supplier they have two meshes of nepheline syenite: 270 and 400. Do we always opt for 270?