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A few quick questions for the glaze experts out there. Background: I'm very excited to be creating my first base glazes - a simple cone 6 clear for a white (talc free) clay body. I also have a dark red clay body with obviously a high iron content. And then after that I will be going for a cream color glaze and then a temmoku. I have no real interest at the moment in bright glossy colors. I have 2 different options for silica - sand (white) and flint (270M) - Which is the best starting point or should I just get some of both? I want to give myself the most possibilities for testing and using in secondary glaze recipes. For the base white recipe I want to use it calls for Tin Oxide Tin Oxide vs Zircopax - Tin Oxide is REALLY expensive and I am reading a lot that Zircopax although it can be substituted at around 2:1 for Tin Oxide, it tends to kill the colors that oxides produce a bit. Not too big a problem for me I wouldn't think at the moment and none of the Temmoku I want to test calls for it. Does Zircopax work in a wide range of recipes and does it have any caveats to watch out for? Thanks much! Very excited to get going and will post results as I go.