Slate Blue

Source describes a semi-matt light slate blue that darkens with more soda deposition.

Ingredients

Material%
EPK Kaolin24
Wollastonite (Theoretical)20.3
Silica19.400000000000002
Ferro Frit 319514.000000000000002
Minspar 20012.3
Whiting5.7
Rutile4.2
Nepheline Syenite2.8000000000000003
Copper Carbonate2.1
Cobalt Carbonate2
Ferro Frit 31101.5
Molybdenum Trioxide0.44999999999999996