Overtone Color-Depositing Conditioner, $40, Available at Amazon
When I had my hair dyed red, one of the fastest-fading colors, I was dreading having to go back to the salon for necessary color touch-ups. For context, I go to the salon about once a year, max — meaning I'm not going to go every few weeks for new color.
Instead, I use Overtone Color-Depositing Conditioner in the shower — allowing me to avoid the hair salon while keeping my hair vibrant and conditioned.
I liked using the Extreme Red deep treatment, which had the clearest effect on my hair in terms of moisture and color — especially since I was not washing my hair every day. You can even use this on color-free hair as a color boost or temporary color — which is cool as a brunette when I want to add a hint of color that is only visible in the light.
A note of caution is that it can potentially stain white clothes or pillowcases despite the advertisement that it will not do so. I find that sleeping with a towel over my pillow helps and is a small price to pay compared to going to the salon for regular color touch-ups.
It's my favorite product to recommend to folks who have dyed their hair in the past — especially if they do a solid color. The company's customer support is really helpful as far as choosing which colors will work best on your hair and helping guide you to your desired outcome. — Starr Chen, INSIDER Software Engineer