Persian Blue

Stoneware bowl in Persian Blue and Rustic White glazes, cone 8, by Amy Myers
Stoneware bowl in Persian Blue and Rustic White glazes

Persian Blue Glaze

Persian blue is a classic blue color created from the combination of cobalt and copper.  I have used the same basic feldspathic glaze here as for the Copper Green; with the addition of the cobalt carbonate, it becomes a little more fluid.  This, combined with the deeper color, makes for a more reflectant glaze surface, an effect only partially offset by the addition of tin oxide.  For decorative ware.

Feldspathic #3 Formula: Persian Blue



K2Na2O .25

Li2O  .26

CaO  .49

Al2O3.  .52

SiO2.  3.25

B2O3.  .26


2% each of Copper Oxide, Cobalt Oxide, and Tin Oxide


Feldspathic #3 Recipe: Persian Blue



Custer Spar... 44.6

Spodumene... 28

Gerstley Borate... 10.4

Whiting... 9.2

Flint... 7.8


2% each of Copper Oxide, Cobalt Oxide, and Tin Oxide