Don't know if you found the key underneath for the test tiles. What you are seeing is the wash being painted on and different glazes producing different colour variations. (Note to self, read other posts first ) Just saw the other post xD
To get all the different looks they have on those tiles you need the wash and 4 different glazes. Some of them are fired to cone 4 and some to cone 6.
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If you are looking to get the most variation out of the smallest purchase I would maybe buy a clear glaze, white glaze, a semi-matt or whatever kind of matt you are into. Get a few mason stains that you can colour the glaze/clay/paint and maybe a wash or two for painting under or over glaze.
That would probably get you started. It all depends what kind of surface you are looking for and the colours.
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