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To: jbIII who wrote (1439)5/19/1998 10:56:00 AM
From: go4it  Read Replies (1) | Respond to of 1913
 
John, I know you didn't ask me but thought I would answer anyway. It is common practice for a firm to add a blank sample (one that is known not to contain any of the item being tested i.e. gold). This is a quality assurance measure to ensure that data received is accurate and that no tampering or salting has occurred