Usually describes a bamboo colored matte glaze (especially in reduction stoneware). These are normally achieved in a magnesia white matte by adding a small amount of iron (0.5-1%) and possibly some tin oxide opacifier.
A tin oxide addition can improve the visual of a cone 10R bamboo
This is the G2571A base dolomite matte recipe. The specimen on the left adds 4% tin and 1% iron oxide. The one on the right has 4% tin oxide and 0.5% iron oxide.
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