Links to related information on other sites:

The Care and Preservation of Glass and Ceramics 
http://www.thehenryford.org/explore/artifacts/glass.asp

Conserving Ceramic Treasures 
http://www.civilisations.ca/archeo/ceramiq/conserve.html

Ring Supports for Pottery and Round-Based Objects (Conserve-O-Gram 4/12) - (An Adobe PDF file) 
http://www.cr.nps.gov/museum/publications/ conserveogram/04-12.pdf

Removing Dust from Ceramic and Glass Objects (Conserve-O-Gram 8/1) - (An Adobe PDF file) 
http://www.cr.nps.gov/museum/publications/ conserveogram/08-01.pdf