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V4 2001 INDEX       E-SYLUM ARCHIVE




The E-Sylum:  Volume 4, Number 3, January 21, 2001, Article 6

SPECIFIC GRAVITY 

   Dan Demeo writes: "With regard to Rafael Delgado's inquiry 
   about metals having specific gravity around 7 (6.9-7.3), there 
   are lots of choices, some of which could be eliminated easily: 

        chromium--7.20, but too hard to strike coins 
        cast iron--7.2--but brittle, and it rusts 
        tin--7.28--a good possibility 
        zinc--7.14--another good one 

   There are quite a number of metals and alloys which fit the 
   range specified.  One way to determine the composition is to 
   put the object in a scanning electron microscope (SEM) and 
   analyze the surface using energy dispersive x-ray analysis 
   (EDX).  PCGS has had this done, so Mr. Delgado should 
   be able to have his object (coin?) analyzed or authenticated 
   through them.  Or, he could look up local laboratories offering 
   SEM/EDX services or x-ray fluorescence services.  On the 
   bad side, it might cost several hundred dollars for the analysis, 
   but he will have an answer, which is always better than all the 
   guesses in the world." 

  Wayne Homren, Editor

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