Dealing with colors in the project

Something pretty simple, yet very useful. Just imagine, you got beautiful app mockups from the designer, with perfectly specified colors in RGB or hex format (or you only got colorful mockups and had to ask “Hey, what’s hex for this button?”). Surely some colors will occur many times in different mockups for the same app. Also, during the app development process, the UX team may change the app appearance many times. How we can define constant values of colors in an elegant, clean, and easy to change way?
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