Ingredients

Ingredient Amount
Whiting 14.10
Ferro Frit 3134 13.10
Nepheline Syenite 44.40
EPK Kaolin 3.10
Silica 25.30
Add Amount
Black Copper Oxide 2.00

Instructions

Published in "Emerging Glazes," in the May 2016 issue of Ceramics Monthly, page 86.

Green/Blue glaze in oxidation (shown on the top half of the cups in the image here). Because copper is used as the colorant, this glaze is red when fired in  a reduction kiln.
This glaze settles out and needs a suspension agent. Try: Veegum T, Bentonite, CMC Gum, or Epsom Salts. The last two will thicken the glaze slurry and help to suspend particles in the process.