This is GA6-B, a transparent amber glaze at cone 6. The color darkens in the recesses as a simple function of thickness.

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This is the Ravenscrag slip cone 6 base (GR6-A which is 80 Ravenscrag, 20 Frit 3134) with 10% Mason 6006 stain (our code GR6-L). Notice how the color is white where it thins on contours, this is called "breaking". Thus we say that this glaze "breaks to white". The development of this color needs the right chemistry in the host glaze, and it needs depth to work (on the edges the glaze is too thin so there is no color). The breaking phenomenon has many mechanisms; this is just one. Interestingly, the GR6-A transparent base has more entrained micro-bubbles than a frit-based glaze; however, these enhance the color effect in this case.
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