Mastey Color Instantané 4.0 Medium Brown Hair Color Toner

I've got this bottle of Mastey Color Instantané in shade 4.0 Medium Brown. It's a demi-color and toner designed to help refresh or correct hair color for a richer look. The bottle is 8 fl oz (236 mL). It's been opened but there's still plenty left if you're looking to touch up your color.