Matrix SoBoost Hair Colour Additives are shades that can be mixed with the SoColor and ColorSync Collections to create soft pastel tones or applied full strength to pre-lightened hair for bold, vivid effects. All are mixable for an endless variety of shade results.
Copper helps to boost vibrancy in auburns, warm browns and golden blondes.
Please note: This product must be mixed with a developer or peroxide before applying to the hair (sold separately).