Hello anajala123,
Thank you for posting in the Apple Support Communities.
We know it's important to have the Touch Bar in color to easily select which emoji you'd like to use. Let's take a closer look into this.
Are you experiencing this issue when using a specific app on your Mac?
Please try restarting your Mac in safe mode. Safe mode prevents your Mac from loading certain software as it starts up, including login items, system extensions not required by macOS, completes a basic check of your startup disk, and clears cache. Start up your Mac in safe mode
Let us know how the Touch Bar looks while in safe mode. Restart your Mac to exit safe mode.
If you're continuing to experience the same thing, please try resetting the SMC: How to reset the SMC of your Mac
This process resets the power to your Touch Bar.
Let us know the result.
Take care.