Quickly Wet-mixing Multiple Additive Tests

@ceramicmaterialsworkshop's "Understanding Glazes" course uses the following method to quickly mix variations of a glaze using one batch of base glaze and nine different types of additives (e.g. cobalt, copper, iron, stains) in two different amounts each.  It's a really simple way to learn how different additives like colorants and opacifiers affect a glaze.

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The glaze abides..

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