From Longman Dictionary of Contemporary Englishbottle greenˌbottle ˈgreen noun [uncountable] CCa very dark green colour —bottle green adjective
Examples from the Corpus
bottle green• The braiding neatly divides my sample into a purple top half and a bottle green lower half.• Strong, striking classics - black, bottle green, red, charcoal grey, navy, purple and white.• The sea was bottle green and silky inshore, out of the sun, light blue and slightly rippled further out. 