Yes, CARMINE is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, R 1, M 3, I 1, N 1, E 1.

Is it a valid word?

CARMINE is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies

Also: blood-red, cherry-red, ruby-red.