It is up to the applicant to decide whether to specify a color when applying for a trademark. The specified color cannot be changed when it is used later. The following suggestions are for reference: there is no need to specify a color for word trademarks, and they can be colored arbitrarily (single color) when used in the future; graphic trademarks or trademarks with graphics, there is no need to specify a single color when used in the future. , if there are multiple colors in actual use and will not be changed at will, it is recommended to specify the color when registering.