Posted 13 January 2014 - 06:50 PM
Mixing a Black Glaze with a white glaze will work IF they are the same base recipe.OR you could mix your white glaze and add a small amount of Mason 6600 Black following reference code.. By small I mean somewhere between .5 to 1.5 %. You may need to do tests in .5% increments to find what you want.
I have used Nickel Carb. and cobalt, Iron and cobalt, Iron and Nickel, Copper and Nickel, Manganese and Nickel to get grays.
Try some color blend tests #1=base with rutile 1-2%% in the base or not ,#2 maybe Nickel 0.5-3%,#3= Iron 1.0-5%, #4=copper carb.2-6%, #5=manganese .5-3%
#6=cobalt carb. try .5 up to 1%
If out of these 21 tiles you see potential, try refining the color you desire. And try again.
1-2, 1-3,1-4 1-5, 1-6
The results will depend much on your base. Find a base with the texture you are after.Use texture on your test tiles to show breaking (color variation)tendencies,