This is what the entry from the Zecchi site looks like to help in ordering: “ PERMANENT RED LIGHT. Chemical composition: Synthetic Organic Pigment (Monoazo). (Series: 5) .” Here is our best guess at the equivalent in Italian. This is from the Italian portion of the site: “ ROSSO PERMANENTE CHIARO. Composizione chimica: Pigmento sintetico organico monoazoico. (Gruppo: 5).”