Keracolor Clenditioner Color Depositing Conditioner Colorwash - Instantly Infuse Color into Hair, 15 Colors | Cruelty Free : Teal

I've stopped dyeing my hair a couple of months ago I have decided to let my Gray grow out. I'm thinking this may help with that transition considering

will this stain my countertops (fake white marble look)?

If you have dark brown hair, will it help the “skunk” look in the dark to gray transition? Know it’s not dye, just want to darken the white grow out.

How well does it work to tone light brown/ dark blond hair?