Brass is the most common complaint we hear from guests who colored their hair elsewhere — and the most misunderstood. Here’s what actually causes it, what fixes it, and when a quick gloss won’t be enough.
Where brass actually comes from
Brassiness is warm pigment — orange, yellow, copper — surfacing in hair that was lifted. It is not a sign your hair is “too light” and it is not bad luck. The three usual culprits:
- Hard water. NYC water is mineral-heavy, and those minerals (iron and copper especially) deposit into the cuticle and read as warmth, especially on blonde and lightened hair.
- Heat. Flat-irons and hot blowouts slowly “cook” lightened hair, pulling warm undertones forward.
- Box dye and rushed lift. At-home or overly aggressive lightening often lifts unevenly, leaving warm bands underneath that a toner was never properly given a chance to correct.
What a gloss or toner actually does
A gloss is a demi-permanent tone that sits on top of your existing color and cancels the unwanted warmth — violet cancels yellow, blue cancels orange. It does not lighten. It adjusts the tone back to cool or neutral and adds shine, and it fades gradually over four to six weeks.
A toner works on the same principle, applied right after a lift to set the final shade. The point to understand: gloss and toner correct tone, they don’t fix uneven lightness. If your brass is simply a tone issue on evenly lifted hair, a gloss is the fast, low-damage answer — at Red Market a gloss is $95, and a Single Process + Gloss is $210 when you’re also refreshing your base or roots.
When it needs a correction instead
If the brass is banded — patches of darker warm color under lighter ends, or roots a different color from the lengths — no gloss will even it out, because the problem is uneven lift, not tone. That is a color correction, a longer and more careful service where we lift and tone the hair back to even in stages. It is the honest answer when someone has been box-dying over old color for a year and the warmth has built up in layers.
Keep it from coming back
Wash in cooler water, use a purple or blue toning shampoo once or twice a week (not daily), protect against heat, and treat the hard water itself — a Malibu C treatment ($56) lifts the minerals that keep re-brassing your blonde.
Not sure if it’s a gloss or a correction? Book a consultation or read more about our hair color in NYC.
Learn more about Hair Color NYC at Red Market Salon, New York.