Add a few drops of your homemade food coloring to some unsweetened coconut flakes and stir them well allowing them to absorb the coloring.
Spread out the tinted coconut thinly on a baking sheet or a dehydrator tray.
If using a dehydrator, follow the directions for your particular dehydrator to dry out the coconut so that you can safely store it again.
If using a convection oven, set it to low temperature with the fan on, occasionally checking to see if the shredded coconut has fully dried. It's a good idea to stir it up and spread it out again to help move the process along and make sure that the coconut has fully dried.
Store in closed containers, once fully dried, in a cool, dark place.