For the 1969 Eurovisiong Song Contest, Salomé wore a dress made out a particular material. Which one?

Explanation

Salomé (born Maria Rosa Marco in 1943) represente Spain in 1969 with the song "Vivo Cantando". It wsa composed by Maria José Cerato and Aniano Alcalde and came joint first alongside France, the Netherlands and Great Britain. More memorable than the song, however, was the dress - it was made out of china and weighed 14 kg.