| ballaton | a metal die given a cross-relief effect on glass. Inside the die are small square-capped "points" which, when the glass is blown, result in the cross-relief pattern. By cevering a PEA stamped in this way with a layer (coperta) of glass, using the sommerso technique for example, an effect is obtained whereby hundreds of minute air bubbies are trapped between two layer of glass |
Technical Glossary 
