The paper deals with frequency behavior of adjectives of color, which was researched on the base of semantic annotation of Russian National Corpus (RNC) and standard computer technologies (MS Excel). The authors suggest a classification scheme for color adjectives tagged with semantic markup of RNC. The obtained results show the model of frequency behavior of color adjectives in poetic texts within a period from 1750 to 1999. It was revealed that IPM of color adjectives grows significantly at the beginning of 20^th century. The frequency behavior of these adjectives correlates to their classes.