This is what the entry from the Zecchi site looks like to help in ordering: “ VIRIDIAN STANDARD. Chemical composition: Sodium Aluminosilicate Polysulfide + Phthalocyanine. (Series: 5) .” Here is our best guess at the equivalent in Italian. This is from the Italian portion of the site: “ VERDE SMERALDO STANDARD. Composizione chimica: Alluminosilicato di sodio polisolforato + ftalocianina. (Gruppo: 5).”