Erik Selin writes:
When revisiting older projects or when you just recently moved a project file, you may have come across the pink color for texture, promptly letting you know something is missing. Not a pretty sight. Since I recently started to sort out my old archive, I started to use this simple but effective system to keep track of all the data.
You can find the article in the link below if you want to learn more about dealing with missing texture files and some simple ideas on how to avoid them.