Root Cover Up - L'Oreal Root Cover Up is a temporary gray concealer. 3 Seconds to flawless roots. Ammonia and peroxide free. Good for all hair types and textures. Benefits: Magic Root Cover Up conceals grays in seconds for flawless roots. Lightweight formula, no smudging or sticky residue, ammonia and peroxide free. Perfect for in-between salon visits, Magic Root gives coverage to gray roots and lasts until your next shampoo. Good for all hair types and textures Formulated Without Ammonia - Root Cover Up.