
Toluidine Red
This is what the entry from the Zecchi site looks like to help in ordering: “ STUDIO RED. Chemical composition: Monoazo (PR3). (Series: 2) .” Here is our best guess at the equivalent in Italian. This is from the Italian portion of the site: “ ROSSO STUDIO. Composizione chimica: Monoazoico (PR3). (Gruppo: 2).”







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