Splat | Midnight Rosetta | 30 Wash | No Bleach | Pink Semi-Permanent Hair Dye

Can I just use some of the dye and save the rest for a later use?

Will midnight rosetta cover over midnight magenta? or will it just make my hair a darker pink color?

The box says this dye will stain countertops. Will I be able to get the stain out of the countertops with bleach?

Will the color run or transfer to clothes if you sweat a lot?