What precautions should I take during application to avoid staining?

The formula contains concentrated direct blue pigments that are designed to adhere to keratin. During application they will stain anything they touch: skin, nails, countertops, tile grout, shower curtains, and towels. Before starting, put on the gloves provided (or nitrile gloves), drape an old towel over your shoulders, and smear a thin layer of petroleum jelly or barrier cream along the forehead, ears, and neck to catch drips. Work in a well-ventilated room with a wipe-clean surface. If product splashes on skin, wipe it off immediately with an oil-based cleanser or micellar water — once it sets, it can take several days to wear off. Rinse the shower or sink with warm water and a non-abrasive cleaner right after rinsing your hair to prevent permanent blue marks on porous surfaces.