Schwarzkopf Color Boost Blonde

Schwarzkopf Color Boost Blonde retails around $13 for a 1 fl oz bottle. I found Schwarzkopf Color Boost is easy to use. I mixed 5 drops into a tbsp of conditioner and allowed the conditioner mix to set in my hair for 5 min. Schwarzkopf Color Boost Blonde contains purple pigments which slightly deepened the hue of my purple dyed hair. I would like rate Schwartzkopf Color Boost Blonde higher if the Schwartzkopf brand was certified as cruelty free.