We are all on-the-go these days and even hairstylists can become too busy to get their own hair touched-up. Years ago, stylists sold touch-up crayons to their clients that were waxy and didn't wash out of the hair all that great.
Now Style Edit has created Conceal Spray available in blonde, auburn, light/medium brown, and black. Conceal Spray has a tiny little sprayer and is aerosol which gives you maximum control whether you are concealing grey in your part or hairline or camouflaging a bald spot. Also great for people whose hair grows really fast. Washes out easily too with no residue left behind. This product will run you about $20 and fair warning...you will be addicted!