Glass Discussion & Research. NO IDENTIFICATION REQUESTS here please. > British & Irish Glass

A bit of showing off

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chopin-liszt:
It was Christine and then DavidE. and then John who found some. Not me, Nigel.
I haven't been that lucky yet. :'(

It's just that there has been talk before of something (and I can't remember what now, but it was very high quality) something that there wasn't a lot of - and the prices did not reach the skies, simply because there wasn't enough of it around to support any sort of collector base - it was just too obscure.

(ps. give Celia a hug from me!)

nigel benson:
Sorry all. I was visualising Christine and thinking your name Sue, doh!!

Something I didn't detail earlier was that there were five items of Alexandrite in each of the Parkington sales, making a total of ten, but split into six lots (three in each sale). The largest (tallest) piece was a single drinking glass with a hollow stem, having a ribbed foot, but bowl and stem were plain it - this was the one that achieved the highest price. The ten pieces split into five plain and five with diamond moulding.

Noting the split of moulded and plain items it is therefore not a characteristic that should be used for identification of Webb's Alexandrite.

Blimely Sue, she doesn't let me hug her, so................  ;) :)

Cheers, Nigel

glassobsessed:
Thanks Nigel, it is very useful to have more information, it all helps to add context.

I could end up making a hash of the following but in for a penny...

As I understand it (which is not a lot) a dichroic effect in glass is seen when the glass is viewed from different angles. It is akin to a polarizing effect as far as I can tell (not that I really understand that either).

It is a different process than that seen in say neodymium glass where the effect appears when the light source is changed between incandescent/daylight and fluorescent light.

John

flying free:
hmmm, mine shows a fine chocolate rim in every light ... and whether lit from behind or in front, and whether viewed from top or side.  It's a very very fine chocolate line but it's there at all times.  It doesn't look like a dichroic effect to me (is the Lycurgus Cup classed as dichroic i.e. shows green when viewed from front but with light shone behind it, but shows as a red piece when light is shone from the front onto it and therefore refracted off the glass?)
However, I've no idea how the chocolate rim was created (although pretty sure it wasn't 'added' on in anyway).  I presumed it was the colour that resulted from the reheating of the glass at the edge. 
m

Frank:
It is only an edge effect but is usually visible because of the way the lip was curved. As I recall it was possible to turn it to an angle it did not show. I know we (Michael and I) talked about the dichroic aspect as I saw these shortly after having the first and only dichroic Monart in my hands for a few days.

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