This study explores the temporal changes in sentiment associated with eight color names over an 18-month period at four observation points. We focus on the valence aspect of sentiment. We collected four datasets, each separated by 6 months, and each containing 18 000 mentions of each of the eight color names in English from Twitter users around the world. We calculated the weighted average sentiment score of each instance when a color is mentioned.We find that purple and pink are the most positive in average sentiment score in all observation points, whereas brown, red, and orange are ranked as the lowest in average sentiment score. In terms of relative rank in sentiment value associated with the color names, we find the three consecutive datasets of July 2020, January 2021 and July 2021 are more consistent with one another, while the January 2022 dataset is more different from the earlier three datasets. This finding indicates that the temporal consistency in color-associated sentiment might maintain within 1 year, while evolve and show more difference in a longer timeline. This study is useful to marketing professionals by revealing that color names are associated with sentiment and that these associations can be monitored using social media data regularly. We suggest that marketers can use our method to analyse the color-associated sentiment of color names regularly, maybe on an annual basis, in order to choose color names wisely.