Furthermore, how do I make my oVertone work better?
When you're ready to rinse, don't be afraid of hot water. Hot water actually helps our products work better by opening up your hair cuticle a little. After you rinse out oVertone, your hair should have soaked up most of the color, so the conditioner should rinse mostly clear.
Subsequently, question is, can you leave oVertone on longer than 15 minutes? My regular box dye needs to stay on for 30-35 minutes, but oVertone works VERY differently. They suggest keeping it on for 10-15 minutes but I found keeping it on closer to 5-7 resulted in a shade I liked better.
Herein, how easily does oVertone wash out?
One thing to note is that oVertone is not meant to be a one-wash and the color is gone type of deal. Results can range from washes-out-in-a-week to never-coming-out-completely-without-bleach. So you can see why there is no one-size-fits-all answer.
Is oVertone worth the money?
They are worth it, but it can drill a hole in your wallet if you have to keep buying to keep your hair color stay in. They are expensive, but IMO yes, worth it. Some hair colors doesn't stay in very well compare to others and they CAN be washed out if you don't keep up with weekly deep treatment.