Also black wash.
1. Med. A lotion composed of calomel and lime-water; grey lotion.
1818. A. Cooper, Surg. Ess., I. (ed. 3), 166. Under the black-wash poultice.
1854. J. Scoffern, in Orr’s Circ. Sc., Chem., 495. The lotion known in medical and surgical practice, as the black wash.
2. Any black composition used for washing over and blackening (Also blackwash.)
1861. W. H. J. Weale, in Times, 12 July, 5/6. The blackwash was removed from the paintings; bad taste and want of means caused the whitewash to be left. [See next.]
