1619 F. Beaumont & J. Fletcher v. sig. K4 Art thou gold proofe? theres for thee.
1730 H. Fielding iii. i. 38 If the Woman be not Gold-Proof, she will be bribed to swear against you.
1842 38 ii. 14 The Khyberies are gold proof... They said.., ‘It is a religious war, and gold will not buy our religion.’