Dyer, F. N. (1971). Color naming interference in monolinguals and bilinguals. Journal of Verbal Learning and Verbal Behavior, 10, 297-302.

English-speaking monolinguals named colors as quickly as possible when the color stimuli were color names written either in English or a number of other languages. Color naming was found to be slowest for English words and increased in speed as the foreign color names became less similar to their English equivalents. In a second experiment, Spanish-English bilinguals named colors in both languages with color stimuli that were either Spanish color names, English color names, or control Xs. Color naming was slowest when the naming language and the language of the color names was the same although considerable interference also occurred when they differed.