Legal analysis: If no color is specified when registering a trademark, in principle, the color can be changed at will in actual use, and the registered trademark logo can be marked, which is not considered as a violation of the provisions of the Trademark Law. 1. If a trademark registration does not specify a color, the Trademark Office shall protect it according to the black and white color, and shall not protect other colors in use; 2. The trademark registrant shall not change the name, address or other registered items of the registered trademark, and other registered items shall include the color of the registered trademark; 3. If the trademark registrant does not specify the color when applying for registration, even if the color of the trademark is changed, it is not regarded as changing the registered items of the trademark, and it does not violate the provisions of the Trademark Law.

Legal basis: Paragraph 1 of Article 49 of the Trademark Law of the People's Republic of China stipulates that if a trademark registrant changes the registered trademark, the registrant's name, address or other registered items during the use of the registered trademark, the local administrative department for industry and commerce shall order it to make corrections within a time limit; If it fails to make corrections within the time limit, its registered trademark shall be revoked by the Trademark Office.