Gold plated escale mount, black Murano glass onion shape, inserted gold leaf. Gold plated escale mount. Black Murano glass. Murano glass is an extremely complex process. The techniques used to produce marcel Franck glass bottles have been developed over centuries. The glass-master rolls the flaming glass on the end of the blowpipe over thin leaves of gold. As the glass is blown, the leaves reduce to fine pieces into gold dust giving this beautiful effect.