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Marking Chalk Sawn from Natural Chalk
Natural chalk is a soft, white, nearly pure calcite rock. It marks because it crumbles and leaves loose particles on rough surfaces, which wipe away again. Saw a clean lump into square sticks, round the ends and let them dry.
The picture: a block of chalk from the White Cliffs of Dover.
初学者
An afternoon, then drying
说明
1
1
Pick and square a lump
Pick and square a lump
Choose white chalk without hard nodules or grit, which would scratch. Saw the lump square on a bench hook.
此步骤所需材料：
天然白垩（生料块）1 公斤所需工具：
小手锯
锯割挡板
防尘口罩2
2
Saw the sticks
Saw the sticks
Saw the block into slabs, then the slabs into sticks about 12 mm square and 80 mm long (our size). Chalk is soft; let the saw do the work.
所需工具：
小手锯锯割挡板防尘口罩3
3
Shape the ends
Shape the ends
Round or point one end of each stick with a rasp or knife, for a fine line.
所需工具：
粗齿锉
刀4
4
Dry
Dry
Quarried chalk holds water. Leave the sticks on a rack in a dry, airy place until they no longer feel cool and damp (our check).
所需工具：
晾干架5
5
Sticks from a lump
Sticks from a lump
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