As nouns the difference between sulphide and ferretto
is that sulphide is while ferretto is copper sulphide, used to colour glass.
sulphide
English
Noun
(
en noun)
A kind of clear marble with a small statuette or figure inside.
* 1997 , Miriam L. Plans, Caring for your antiques & collectibles (page 94)
- Rare marbles, especially overlays, sulphides , clambroths, and other unusual specimens, need gentle washing and drying.