Keys are detected by different colors by nail polish:
A simple dot can be the identity of a key on its head
Full head can be colored to detect them
Only one key may paint different color than all the keys in the ring
One can paint a glow colors so they can easily find in dark
Drawer and key can be same color to find key quick
Process:
First select which one you want to do with your keys. Paint your color on it. Allow some time to dry these keys and it will be ready to use.
Paraphrased by: Sakib Jubab