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<p>[QUOTE=&quot;Silver, post: 321193, member: 6202&quot;]No, I don&#039;t have any means of testing. Certainly no chemical means. I have been reading on using the specific gravity method but I don&#039;t think I have a sufficiently accurate scale and I don&#039;t really understand how the method works. School science lessons were a long time ago</p><p><br /></p><p>There&#039;s a lot of information you&#039;ve given, and in the various other responses,&nbsp; which I will need to study more carefully later.[/QUOTE]</p><p><br /></p>

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