There are no specific requirements. For details, please refer to the following legal provisions.

According to Article 8 of the Trademark Law, any visible mark that can distinguish the goods of a natural person, legal person or other organization from the goods of others, including words, graphics, letters, numbers, three-dimensional Logo and color combinations, as well as combinations of the above elements, can be applied for registration as trademarks. The above illustrates that color combinations and combinations of colors with other elements can serve as trademarks... Therefore, it is wrong to say that trademarks do not protect colors or that color trademarks do not protect colors.

It depends on the actual situation when applying for trademark registration. When applying for trademark registration, if you have not applied for protection of a designated color, you can change the color at will; when applying for trademark registration, if you apply for protection of a designated color, you cannot change the color.