For people with blonde, highlighted, gray, or silver hair who already use Paul Mitchell shampoo, conditioner, treatments, or stylers and want a customizable way to dial toning up or down — rather than switching to a dedicated purple shampoo. Because it's intermixed a few drops at a time into another product, it suits people comfortable with an extra small step in their routine. This is a consumer retail product for at-home use, not a bleach or permanent-color additive, and not a salon-only professional item.

What sets this apart from a pre-mixed purple shampoo is control: instead of a fixed amount of violet pigment in every wash, you decide how many drops go into your shampoo or conditioner that day, so a quick touch-up and a deeper brass-correction session can come from the same bottle. That also means it layers into a routine you already have rather than replacing it — useful for anyone who likes their current Paul Mitchell shampoo or conditioner but wants to add toning power only when they actually need it.

Add several drops of the toning drops to your favorite Paul Mitchell shampoo, conditioner, treatment, or styler in the palm of your hand. Mix well, then apply to clean, damp hair. Use more or fewer drops depending on how much toning you want that session. Wash hands immediately after use, since the concentrated pigment can stain skin and light fabrics.

Pros: the small dropper bottle makes dosage fully adjustable — a couple of drops for subtle upkeep, more for stronger brass correction — so one bottle can flex between light maintenance and a deeper toning session; it mixes into whatever Paul Mitchell product is already in your shower rather than requiring you to buy and store a separate purple shampoo; the single-dye formula (no blue pigment) keeps the tone reliably purple rather than drifting cool-gray.

Cons: it has to be mixed fresh into another product every time rather than being ready to use on its own, which is an extra step compared with a bottled purple shampoo; the concentrated violet pigment can stain skin, nails, and light-colored towels or sinks if hands aren't washed immediately after use; at 0.85 fl. oz., frequent users will go through a bottle fairly quickly.