This is what the entry from the Zecchi site looks like to help in ordering: “ Nikel-Titanium Yellow. Chemical composition: Ossido di Nichel-Titanio e Antimonio (Series: 6) .” Here is our best guess at the equivalent in Italian. This is from the Italian portion of the site: “ GIALLO NICHEL-TITANIO. Composizione chimica: Ossido di Nichel-Titanio e Antimonio (Gruppo: 6).”