Irradiated Glass.

Some Lalique Glass varies in value according to color.
Some collectors are prepared to pay more for rare differences in color .
These effects were due to differences in additives originally designed to enhance and clarify glassware.

Up until 1930 some glassmakers used Manganese to remove color defects from pressed glass.
This worked well but eventually changed the basic color of the glass when it was exposed to sunlight for a long time.
Arsenic was also used in glassmaking and the color changed to yellow (remember the very old headlamps on cars ?)

It is changes like these that appeal -however there are now services on the internet that will take a not so scarce item and irradiate it (for a fee) and it then morphs into a more desirable color.

Collectors obviously hate this. There are services that will examine glass and report of the likelyhood of irradiation but these are intrusive examination (may require a tiny chip of glass to be removed) and charge several hundred dollars.

A Quick guide is that the most popular color at the moment seems to be purple.
It is very easy to make the piece go too purple in an irradiation process and you may wishe to make enquiries about pieces that look too dark !
If you are purchasing by auction, it is very easy to check the vendors previously sold items -
For instance,if they have recently sold four or five Bacchantes Purple vases then that might be a clue for you not to buy !

Most glassware has NOT been irradiated and it is really only something you should worry about with very expensive pieces.
(If you are buying an expensive piece then please ask for a certificate of authenticity anyway )

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