Definify.com
Webster 1913 Edition
Blackwash
{
, Black′ washˊ
(blăk′wŏsh)
or Black′wash
}Noun.
1.
(Med.)
A lotion made by mixing calomel and lime water.
2.
A wash that blackens, as opposed to
whitewash
; hence, figuratively, calumny. To remove as far as he can the modern layers of
black wash
, and let the man himself, fair or foul, be seen. C. Kingsley.