Kā tǐ sè

Quick answer：

The term 'Kā tǐ sè' translates to 'Caffeine color' in English. It could refer to the coloration associated with the presence of caffeine in various substances. In the context of food and beverages, it might be related to the coloration of products containing caffeine, such as certain colored candies or beverages. In scientific terms, it could be about the color changes in chemical reactions involving caffeine.