In English, the word about color can reflect different emotions. Blue and grey mean bad mood and red means vitality. A new research found that people are easily affected by the products that are in colors. For example, when students see the red color in the blackboard, they feel not eased. The candies which are packaged in green often not sells well and the food will not considered to be packaged in blue. The rule that color has something to do with people’s mood, so the wise manufacturers make use of this rule to catch people’s attention. They choose the color that pleases customers and make more profits.