3. Use Violet Shampoo and Conditioner Whenever You Give Your Head a Rinse

Purple is the opposite of yellow on the color spectrum so when you apply it to your hair in the form of a shampoo color, it effectively hides the murky yellow and orange tones.

I would recommend replacing your regular shampoo and conditioner with the violet variety to save having to use another product besides your regular shampoo and conditioner to combat the fade.