1758, Valuable Secrets in Arts and Trades ...: Containing Upwards of One Thousand Approved Receipts Relative to Arts and Trades ..., page 219:
Then add two ounces of gum-arabic, and one of Roman vitriol, which infuse four days before straining, and the ink is done.
1785, The Sportsman's Dictionary; Or, The Gentleman's Companion: ...:
The scalding mixture, generally used, is made in the following manner: Take of corosive sublimate, verdigrease in fine powder, and Roman vitriol, of each two drams; of green vitriol, or copperas, half an ounce; of oil of turpentine and train oil, ...
1815, The Repertory of Arts and Manufactures, page 260:
First in the liquor composed of mordant and fustic, then in green vitriol and Roman vitriol, washed off and repeated according to the colour wanted.
