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8:08 pm
NWBA Member
April 19, 2010
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When I took Boys Shop two hundred years ago we were taught to anneal in lime and I have always done that.However,I never see it recommended now. I see vermiculite,KO Wool and other things. Is there some detrimental result from using lime? thanks, Eric S.
9:54 pm
March 18, 2010
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I've always used lime. Easy to get, cheap and works great. Second only to good screened wood ash.
“There are painters who transform the sun into a yellow spot,
but then there are others who, with the help of their art and their intelligence,
transform a yellow spot into the sun.” ~ Pablo Picasso ~
10:53 pm
NWBA Member
Board Member
April 26, 2010
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Lime or ash are a little harder to clean up than the rocks, but only a little.
No matter where you go... there you are.
11:11 pm
November 4, 2010
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The reasons I've only used lime once (in a class, when the instructor provided it) are that: (1) there are several materials called lime, and I've never been quite sure which one is supposed to be good for annealing (calcium oxide is burnt lime or quicklime; calcium hydroxide is slaked lime; and agricultural lime is mostly calcium carbonate); and (2) vermiculite's very cheap, very light, and non-caustic, and wood ash is free and very light (although somewhat caustic), whereas lime is probably cheap, but it's pretty heavy, and quicklime, at least, is pretty caustic.
If I had trouble finding a material to anneal in, I'd probably investigate lime more closely. But it's never been a problem, so I've never bothered.
1:49 am
NWBA Member
Board Member
April 26, 2010
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You want the limestone aka chalk aka calcium carbonate aka agricultural lime aka antacid. Stable stuff. Cliffs & caves are made from it.
Calcium oxide aka quicklime is caustic. Lots of good uses if one is careful, but annealing is not on the list.
Hydrated lime aka calcium hydroxide aka plaster aka lime mortar slowly converts to calcium carbonate if left out in the air. I've never tried it for annealing, but I've slathered some of it on walls or in molds.
No matter where you go... there you are.
2:18 am
March 18, 2010
Offline
Ah yes, I have used vermiculite with good success too. Good call! Works good and not messy. CRS
“There are painters who transform the sun into a yellow spot,
but then there are others who, with the help of their art and their intelligence,
transform a yellow spot into the sun.” ~ Pablo Picasso ~
2:47 pm
I like a nice warm spot in the bed of ashes in a side draft forge. As long as I don't forget it and loose it in there;). (Shasta lost a knife blade in the ash bucket once. Like a sock in a dryer it seems that vortexes to other galaxies do open up occasionally.Even when the bucket was emptied and gone through with a magnet it was not found again. Maybe it was real caustic;)
Of course this method is rather limited and requires that ash filled bed
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