System 30 is Vibrantz’s lead-containing, low-melting color range of glass enamels for the decoration of thin glassware including lamps, fancy glassware and small hollow glassware. System 30 glass enamels have a relative high coefficient of linear thermal expansion (CTE). It is recommended that special care be given when applying these colors, as enamels with a higher CTE than the substrate glass may weaken the glass.