Thought Experiment

Suppose all of the atoms in your body at one instant in time were tagged in some way. Call them "blue". Let's further say that all the other atoms around you were "red". As you go about your metabolic business, how long does it take for the red atoms to replace the blue ones? I imagine this differs depending on the tissue. Your teeth will likely remain pure blue for a long time. Your bones would similarly take a long time to turn red. But what about your organ tissue? Your blood? Your hair? Probably you'll never be made up of 100% red atoms, but how purplish would you be after a day or a month or a year?