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Hardwood Ash from a Clean Fire Lit by Bow Drill
Wood ash is what is left when wood burns: mostly calcium carbonate, with some potash and carbon. Burn clean hardwood right down in a stone-ringed pit, lit from a bow-drill ember, and sieve the cold ash. It is the start of lye, soap, potash and ash glazes; wood gives about 6 to 10 % of its weight as ash.
The picture: white wood ash in a stone fire ring.
初学者
Two days
说明
1
1
Lay the fire
Lay the fire
Sweep the fire pit clean of old ash and rubbish. Lay tinder, then kindling, then split hardwood. Burn only clean wood, never painted or treated (ours).
此步骤所需材料：
硬木原木（栎、槭、山毛榉）50 公斤
火绒束1 个
干树叶与引火柴1 个所需工具：
火塘
等臂天平2
2
Light it
Light it
Make an ember with the bow drill, blow it to flame in the tinder bundle and push it under the kindling.
所需工具：
弓钻3
3
Burn it down
Burn it down
Keep feeding the wood until it is all burned, then let the fire die right down to white ash.
所需工具：
火塘
皮革工作手套4
4
Collect and sieve
Collect and sieve
Leave it a full day to go cold (ours). Shovel the ash out, sieve out the charcoal bits, weigh it and keep it dry in a lidded metal bucket.
所需工具：
铁锹
细目筛等臂天平
带盖金属提桶皮革工作手套
防尘口罩5
5
Ash from your wood
Ash from your wood
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