The only thing I can find on this: https://www.plymouth.ac.uk/news/toxic-substances-found-in-the-glass-and-decoration-of-alcoholic-beverage-bottles https://www.

The only thing I can find on this: https://www.plymouth.ac.uk/news/toxic-substances-found-in-the-glass-and-decoration-of-alcoholic-beverage-bottles https://www.plymouth.ac.uk/news/toxic-substances-found-in-th... In short, only the enamelled decorations may contain heavy metals, which leech in the environment after use. This is a serious problem, but not with glass as such.