Hello, the trademark is used as it is when registered. If you apply in black and white when registering. When using it, you can fill in the color according to your needs. If the color is specified when registering, it must be used according to the color when registered. As for why the numbers behind the glass Fenjiu trademark are blue, it may be that the design is an anti-counterfeiting measure, or it may be for aesthetic appearance, or it may be that the color was specified during registration.