This is what the entry from the Zecchi site looks like to help in ordering: “ CADMIUM RED DEEP. Chemical composition: Cadmium Sulphoselenide. (Series: 13) .” Here is our best guess at the equivalent in Italian. This is from the Italian portion of the site: “ ROSSO CADMIO SCURO. Composizione chimica: Solfoseleniuro di cadmio. (Gruppo: 13).”