This is what the entry from the Zecchi site looks like to help in ordering: “ NAPLES YELLOW (HUE). Chemical composition: Concentrated Cadmium Zinc Sulfide + Iron Oxide. (Series: 5) .” Here is our best guess at the equivalent in Italian. This is from the Italian portion of the site: “ GIALLO DI NAPOLI (IMIT.). Composizione chimica: Solfuro di Cadmio + Ossido di Ferro. (Gruppo: 5).”