Note 392 — LORENZO DI PIERO DE’ MEDICI (continued 4)
Reading edition
Acqua arzente in modern Italian is the name given to water with nitrous acid in it and is used to clean silver. It is poisonous. Piero Leoni evidently suspected something wrong (perhaps poisonous) in a certain water which had been recommended to Lorenzo. He advises him to go back to his old waters until he analyses the new water.