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The first step would be to have the Pest Control Operator (POC) on contract determine exactly what ant species it is that you are dealing with. That will give you information as to where they are nesting, what they are being attracted to, and where they are getting into the building. Once you have that ...

The responses have been on the right track. The goal is to characterize/identify the crystals which will tell you whether they are from the wood itself or an applied substance. The latter could be part of the original manufacture of the object, or as Craig suggests, a later 'preservative treatment'. ...