Revlon Professional Color Excel in shade 6.65 Dark Red Mahogany Blonde is an ammonia-free, tone-on-tone creme gel colour adding warm red-mahogany tone and glossy shine. This 70ml colour refreshes faded colour and blends grey, fading gradually with no harsh regrowth line. Intended for professional use, it is mixed with Color Excel Energizer in a 1:2 ratio, sold separately. Always carry out an allergy alert test before use.