Preventive measures in caring for glass will help insure its continued use and existence as a family keepsake. Environment Glass is affected by light, heat and moisture.
Deterioration is sometimes difficult to detect.
Temperature Antique glass is brittle and should not be exposed to extremes in temperature. Store valued glass items in a stable environment away from heating and cooling vents, fireplaces, etc. The possibility of damage increases with sudden changes in temperature and relative humidity. Glass objects may shatter when taken from a warm area to a very cold one. A relative humidity of 45 to 50 percent is suggested for glass.