No need to pay out the nose every month for a salon touch up. It's so easy to do it yourself at home.
I literally save hundreds of dollars a year using this method for touch ups!
All of the supplies are available at Sally Beauty supply.
Be sure you use all plastic utensils. Plastic spoon and plastic mixing bowl. Developer reacts with metal.
If you have any questions, comment below. Before I was a makeup artist and formulator, I was a licensed cosmetologist. Happy to help you with hair questions :)