Applying full root touch up
If you have gloves wear them to keep color off your hands.
Wear a button up shirt or a shirt with a wider neck that you don’t care about.
Put a towel or a couple paper towels underneath your color bowl to prevent splatter stains in your bathroom.
Let your color process for 35 minutes. Start the timer when you finish the final swipe of color.
This video will show you the proper way to apply color to your full head without making a giant mess and ruining everything in your bathroom.
This video explains how long to process your color. 35 minutes is the standard for grey coverage using 20 volume developer.