So my hairdresser colored my hair a dark red/auburn with a few (very thin) brighter red highlights this past weekend. I used to dye my hair a reddish brown color in high school, and I remember how quickly the color faded. I bought some shampoo and conditioner formulated for red hair, but I’m wondering, is there anything I can do to keep the color bright until I get it dyed again? A toner, or something deposit-only that I could potentially pick up at the local beauty supply shop? I just don’t want to keep paying out the nose if I can keep the color bright on my own before going in to get it trimmed again. Any tips?