Re: [ATM] Glass Blank Question

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

Jason Lehmann wrote:

>
>Richard,
>
>I found one web site that said the Crown family had densities between 2.5 to
>2.7 g/cm3 and therefore I assumed that it was a type of Crown glass.  I
>don't have much experience with identifying types of glass so your
>information is helpful.  You mentioned it could be Crown-Flint.  The blank's
>vintage is probably at least 10 to 15 years old and maybe older.  Also,
>under closer inspection the blank has Crown-Flint inscribed on it.  I wonder
>if this helps identify it a bit better.  What test can I do at home that
>might be able to help me nail it down?
>
Given that your email address appears to be in the US, common suppliers
for older stuff could be Bausch & Lomb and Schott (any others???).  Three
older types come up: Bausch & Lomb Crown-Flint CF (524510), Schott KF6 
(517522),
and Schott KF9 (523515).  The densities for these are 2.70, 2.67 and 
2.71 g/cc
respectively; I assume +/-0.005.  However, do any of these 6 digit 
identifiers
also happen to be marked on the glass (it could be one or two off in each
half of the 6 digit identifier)?
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