Ultraviolet - UVA/UVB ( 'Tanning" ) Irradiation

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Tests Conducted:

Three Cup Plates (L/R 56 and 467A, which are high lead content "Flint Glass" and a reproduction 440B, made of "Soda Glass" were irradiated for the equivalent of 1.6 years by a calibrated source of UVA/UVB radiation.

Test Results:

There was no change in the color of the test plates as the result of the UVA and UVB radiation to which they were subjected.

Ultraviolet - UVC ("Germicidal") Irradiation

Tests Conducted:

Three Cup Plates (L/R 56 - attributed to the Eastern U.S, 145C - Midwest -0 and 101 - Philadelphia) were subjected to UVC emitted from a special lamp for the equivalent of 18 years years.

Test Results:

There was no change in the color of the test plates.

Comments:

This test has proven very conclusively that exposure of high lead content glass Cup Plates to UVC radiation will not result in any color change in the plate.

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