Shades ALK will be used when you are looking for more robust color deposit, when you require lift from the natural level, a boost in vibrancy from previously color-treated hair that’s faded, and when your client wants tone-on-tone gray coverage that only an alkaline demi can provide.
Shades EQ BI is used when you are looking for sheer color deposit, when there is no lift desired or required from the natural level, when previously color-treated hair that’s faded needs only deposit or shine.