wendysrockpile
off to a rocking start
Member since August 2014
Posts: 8 
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Post by wendysrockpile on Sept 10, 2016 1:12:06 GMT -5
I have recently purchased some slabs and other assorted cuts. They must have been secured in plaster of paris for cutting. There is still some plaster residue on the outside and down in the cracks. How do you get rid of it. I've tried soaking in water, hot and cold, no luck. Thanks for your help.
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Mark K
Cave Dweller 
Member since April 2012
Posts: 2,818 
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Post by Mark K on Sept 10, 2016 2:48:27 GMT -5
I like to cheat, I would use acid myself as long as the slabs will not dissolve.
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Post by jakesrocks on Sept 10, 2016 9:32:38 GMT -5
Good old household white vinegar will remove plaster. Just put your slabs in a glass or plastic bowl & cover them with vinegar. Let them soak over night & rinse with plenty of water.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 10, 2016 13:16:24 GMT -5
Good old household white vinegar will remove plaster. ...and makes a perfectly delightful salad dressing, too  Seriously, although it takes longer than muriatic acid, the vinegar works fine. Like any acid, make sure that your slabs don't contain calcite, limestone or other materials that acid will etch (for those you'll have to soak the plaster in water and remove mechanically). Quartz materials like agate and jasper usually stand up just fine to a soak in weak acid. |
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Erich
spending too much on rocks
Member since November 2015
Posts: 411
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Post by Erich on Sept 11, 2016 9:46:31 GMT -5
If using Muriatic acid I soak the rocks in Baking soda afterwards to neutralize the acid.
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