There are some rules to follow.
Then stick to the time on the box when it comes to washing out the dye.
This is known as bleeding the color (viaGarnier).

Yet even if you rinse until the water runs clear, your hair may still be too dark.
Next, use a clarifying shampoo and mix it with one tablespoon of baking soda.
Let the mixture soak into your hair for five minutes before you rinse.

For maximum benefit, add a hot towel over the shower cap.
“Leave the mixture on for 10 to 15 minutes.”
Color removers are usually found right in the hair color aisle.

