IX. The Practice of Painting: 647.

IX. The Practice of Painting: 647.

647.

Put marcasite into aqua fortis and if it turns green, know that it has copper in it. Take it out with saltpetre and soft soap.

Read ad-free with unlimited highlights, bookmarks, and annotations. $10/mo Become a Supporter Join

Comments and social are coming soon

Reader conversations and shared activity will appear here.

732 of 1778 Book 41% ~1 min left