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Posted in response to Getting iron off rough stones? from Amanda Tinder on December 11, 2007 at 12:18:23:

Re: Getting iron off rough stones?

Depends on what the rock you want to remove it from is made of.
If it is water soluble or something like limestone or Calcite precautions are necessary and u should most likely leave them be.
If it's something like Quartz we use a product called Iron-Out which is a powder u mix with water. It's basically Muriatic Acid from the hardware store or Wal-Mart. Follow the instructions carefully and make sure to use gloves, safety glasses and do it in a well ventilated area to avoid any poisoning and dispose of the leavings properly. I use powdered limstone to neutralize most acids. Also availabe are things like "Whink" which will rapidly remove iron staining but is Phosphoric Acid and dangrous on several levels. CLR will work on some things but I have little luck on Herkimers Diamonds and it's slow to work. Be careful and don't try to clean your best specimens first.

From Don Mello - December 13, 2007 at 07:43:58
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