VAT: Black sheep

“Black sheep by 1822 in figurative sense of “member of some group guilty of offensive conduct and unlike the other members,” supposedly because a real black sheep had wool that could not be dyed and thus was worth less. But one black sheep in a flock was considered good luck by shepherds in Sussex, Somerset, Kent, Derbyshire.” Etymonline.com

Likewise, in society, white sheep are more desirable than black sheep because they (their fleece) can be manipulated (dyed). However, a black sheep in a flock of white sheep is considered lucky perhaps because it implies genetic diversity which makes for a healthier flock.

I’m often like a black sheep that feels wonderful after a shampoo wash, cleansed of the thorns and thistles that everyday life entwines in fleece. I try to convince white sheep to have a wash but they’re afraid the wash will turn them into black sheep, not as commercially desirable but the last to go to the slaughterhouse.