Applying the color to wet hair will help to ensure that the color is evenly distributed throughout your hair. If you are using a Demi permanent hair color that can be applied to wet hair, you should apply it to wet hair. Some Demi permanent hair colors can be applied to wet hair, while others should be applied to dry hair. The answer to this question depends on the Demi permanent hair color that you are using. 7 What happens if you leave Demi permanent hair dye in too long?ĭo you apply Demi permanent hair color to wet or dry hair?.6 What volume developer should I use with Demi permanent hair color?.4 How do you mix color Demi permanent hair color?.3 How long do you leave Demi permanent hair color?.2 Can I use ion Demi permanent without developer?.1 Do you apply Demi permanent hair color to wet or dry hair?.