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Grog from Fired Clay
Grog is clay that has already been fired and then crushed. Mixed into raw clay it opens the body, cuts shrinkage and cracking, and lets steam out as the piece dries and fires, which is why crucibles, kiln bricks and big pots are full of it. It is made by firing lumps of the same refractory clay, or by crushing broken unglazed pots.
初学者
A day, plus a kiln firing
说明
1
1
Make lumps
Make lumps
Wedge refractory clay into fist-sized lumps and let them dry completely.
此步骤所需材料：
耐火黏土10 公斤
水1 升所需工具：
拌料槽2
2
Fire them
Fire them
Fire the dry lumps in the kiln, raising the heat slowly at first so they do not burst.
所需工具：
窑炉
高温计
窑具3
3
Crush
Crush
Put the cold lumps in a sack and break them with the sledgehammer; finish small pieces in the mortar. Wear a dust mask and glasses.
所需工具：
麻袋
大锤
研钵与研杵
防尘口罩
安全眼镜4
4
Sieve into sizes
Sieve into sizes
Sieve through the graded sieves and keep each size apart: coarse grog for bricks, fine grog for crucibles and thin pots. Re-crush what is too big.
所需工具：
筛组（分级筛网）防尘口罩5
5
Store dry
Store dry
Store each size in its own lidded bucket, labelled with the clay and firing it came from.
所需工具：
带盖金属桶
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