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Refined Iron-Rich Clay Slip: the Finest Fraction Settled Out for Black Gloss
The black gloss of Greek vases is a slip of the same iron-rich clay as the pot, made only of its finest particles. Fired in three stages, oxidising, reducing and reoxidising, it stays glossy black while the body turns back to red. Stir the clay in water, let the coarse part settle, and keep only the finest.
The picture: our diagram, clay in water, coarse settled, fine slip kept.
中级
About a week
说明
1
1
Slake
Slake
Break the dry clay small and soak it in plenty of water in a tub until it falls apart. Stir it thin and sieve out grit.
此步骤所需材料：
陶土（赤陶）5 公斤所需工具：
箍木盆
水
木桨
细筛
等臂天平2
2
Settle and pour off
Settle and pour off
Let it stand until the coarse part has settled, then pour off the still-cloudy water into a clean bucket, leaving the sediment.
所需工具：
箍木盆
水桶3
3
Repeat
Repeat
Let the poured-off water settle again and pour off once more; each round keeps only finer particles. Stop after two or three rounds.
所需工具：
水桶4
4
Thicken
Thicken
Let the last bucket stand for days until the fine clay settles, pour off the clear water and keep the thick slip covered.
所需工具：
水桶
玻璃罐5
5
How much is fine enough?
How much is fine enough?
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