Reply to:   RE>photosensitiv insulating material
Both Corning glass and Hoya (Japan) used to make a photo sensitive glass which
could be exposed to UV light and selectively etched to form 3D shapes. The
glass could optionally be thermally treated to form a ceramic. To my knowledge,
these products were discontinued.

Jonathan Bernstein
Draper Labs
jbernstein@draper.com