| http://www.w3.org/ns/prov#value | - Hi , I think this quote is a little misleading , yes finding bits and pieces in the metal can be an indication of its age but should not be relied upon ,this would depend on the quality of the metal and the objects being produced , i have in my collection many glasses from the early 18thc and the 17thc , made form very fine metal both lead and soda that are as clear and imperfection free as any la
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