[Rockhounds] fulgurites

[Gary Brown]

That's "anneal" not "temper". <grin>.

Annealing is the process of the controlled cooling of glass to relieve the
internal stresses caused by fusing.  (Did you know that annealing the BIG
reflecting telescope mirrors can take a YEAR??).

Your glass pal...

Gary
(http://fusedlight.com) 

> -----Original Message-----
> From: rockhounds-bounces at lists.drizzle.com 
> [mailto:rockhounds-bounces at lists.drizzle.com] On Behalf Of 
> Kreigh Tomaszewski
> Sent: Monday, September 15, 2008 7:52 PM
> To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> Subject: Re: [Rockhounds] fulgurites
> 
> Making your own 'fulgurites' is pretty easy.....<snip>
> 
> Let the sand cool. The glass needs time to temper. ...
> <snip>