Hi Keith,

It might have something to do with natural decomposition in the glass,  I may be able to find something in some articles I've accumulated through previous research on site formation processes if you think that may be what's going on, cheers




Charles Alexander
 


 

> Date: Thu, 15 Apr 2010 14:28:19 -0400
> From: [log in to unmask]
> Subject: lamp chimneyss
> To: [log in to unmask]
> 
> Good day,
> 
> I have been cataloging artifacts from a trash deposit of a
> well-to-do rural site in northern NJ (c1770-1840). Among the glass
> artifacts are many fragments of lamp chimneys. There are also some
> pieces of table glass and decanters. While shining a UV light on the
> table and decanter fragments to check for lead crystal, I noticed that
> some of the lamp chimneys also fluoresced icy-blue. I am finding that
> about 50% of the lamp glass in the deposit fluoresces. I have seldom
> paid much attention to lamp glass and I have never before tried a UV
> light on it. Has anyone else noticed or recorded lead crystal lamp
> chimneys? 
> 
> 
> 
> Keith Doms
> 
> McCormick Taylor
> 
> Mt. Laurel, NJ
 		 	   		  
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