Blue Steel is a cool, silver hair dye with blue undertones. For best results, we recommend lightening hair to the lightest level 10 blonde and toning hair that has yellow tones before use to avoid undesired hues. Semi-permanent hair color. Stronger and longer lasting. 4 oz bottle with snap top. Free from: cruelty, parbens, gluten, ammonia, resorcinol, ppd, and phthalates. Vegan. Made in the USA.