How to fix a Hair Dye Disaster

Hair colour correction at NOCO Hair Bristol
Colour Advice  ·  Bristol  ·  NOCO Hair
How to Fix a Hair Dye Disaster
No hair colour disaster is completely unfixable in the right hands. Here is what to do depending on what went wrong.
Colour Correction Brassiness Hair Damage

Whether you trusted your hair to the wrong stylist or an attempt at home colouring went sideways, a dye mishap can feel like a nightmare. But no hair colour disaster is completely unfixable in the right hands. The first step is understanding what actually went wrong.

Colouring hair is a more delicate process than the box dye adverts suggest, particularly when bleach is involved. Here is what we see most often and what can be done about each one.

Brassiness and bad blonde

Blonde is one of the most popular colour results and one of the easiest to get wrong. Too much lift in one direction can leave you with green-grey ashy tones, orange brassiness or a yellow that reads more Barbie than beachy.

Quick fixes for brassiness
Too warm or brassy. A blue or purple toning shampoo used once or twice a week will neutralise yellow and orange tones. These work on the colour wheel principle — cool cancels warm. A purple toning mask used for ten minutes gives a stronger result.
Gone too ashy or grey. Warming toner in yellow or orange tones corrects over-cooled blonde. This is best done in a salon where the exact tone can be controlled.
Stubborn orange highlights. Some orange tones, particularly from overlapping bleach, cannot be toned out. In these cases the hair may need to be re-bleached and started again properly. A consultation will confirm which route is needed.
Blonde colour correction result at NOCO Hair Bristol

Colour correction work at NOCO Hair Bristol.

Hot roots

Hot roots appear when the hair at the root develops differently from the rest, creating a two-tone effect that looks unintentional. It happens most often when previously processed hair reacts differently to fresh colour, or when the heat from the scalp causes the dye at the root to develop faster and lift higher than the lengths.

A small amount of anti-brass or cool toner applied to the roots can help at home. In a salon, a colourist can correct hot roots using a slightly deeper shade at the root to balance the overall result. For future colour, applying the dye to roots last, after coating the lengths, reduces the risk of this happening again.

The cause most people miss
Body heat at the scalp speeds up colour development. A shade that looks right on the lengths can lift two levels lighter at the root in the same development time. This is why root application timing matters so much and why guessing at home often goes wrong.

Colour that has gone too dark or intense

Left colour on too long? The first response is to wash immediately, several times if needed. A clarifying shampoo strips colour faster than a regular shampoo. Follow immediately with a deep conditioning treatment as clarifying shampoo is harsh on the hair structure.

From there, a stylist can advise the best route. In some cases the dye can be removed or lifted. In others, encouraging it to fade naturally over a few weeks while protecting the hair is the better option. Highlights or balayage can also be used to break up the intensity and lighten the overall effect without a full removal process.

Patchy or uneven coverage

Patchy colour coverage is one of the most common results of home dye jobs and can also happen with inexperienced stylists. The causes range from incorrectly mixed product to uneven application, damaged hair that absorbs colour inconsistently, or missed sections.

“My hair was in a bit of a poor state due to box dyes during lockdown and a patchy colour job from another salon. I definitely felt that Marika cared and took the time to go through exactly what I wanted and what she felt would be best for my hair going forward. It looks so much healthier.”
Sophie Wills  ·  NOCO Hair Bristol

A professional can identify exactly what caused the patchiness and correct it using a combination of targeted re-colouring, toner, gloss treatments or condition work depending on the root cause. Colour often needs more than one pass to build depth evenly, in the same way that painting a wall benefits from an undercoat before the finish coat.

Stripey or chunky highlights

Bold, visible streaks rather than blended highlights usually happen when sections placed in foil are too thick. The result lacks the dimension and movement that makes highlights look natural.

Balayage colour correction for chunky highlights at NOCO Hair Bristol

Balayage used to soften and blend overly chunky highlight work at NOCO Hair Bristol.

The two most effective salon fixes are blending the base colour back through to reduce the contrast between highlighted and unhighlighted sections, or using balayage to hand-paint colour in a way that disguises the foil sections and creates a more gradual, natural result.

“Colour correction is one of the most skilled things we do. The consultation is where we work out what actually happened before we touch anything.”
Noel Halligan  ·  NOCO Hair Bristol

Hair dye on skin

Staining around the hairline, neck and ears is extremely common. At the salon we use a professional stain remover. At home, milk on cotton wool works surprisingly well. Regular soap and water clears most fresh stains. For anything more stubborn, baby oil, a gentle body scrub or a small amount of rubbing alcohol applied lightly without scrubbing will usually clear it.

Prevention is more effective than removal. Always use gloves when colouring at home, wipe any drips immediately before they set, and apply a barrier of moisturiser or Vaseline around the hairline before you start.

Damaged hair after colouring

Bleach and permanent dyes work by lifting the outer protective layer of the hair shaft. This is necessary for the colour to penetrate, but it leaves the hair more vulnerable to breakage, frizz, dryness and heat damage until that outer layer recovers.

Managing colour damage
Minor damage. Focus on consistent conditioning. Use a bond-building treatment like Olaplex or a Kérastase masque regularly. Reduce heat. Avoid further chemical processing until the hair has recovered.
Significant damage. A salon assessment will identify the extent of the damage and the best treatment plan. In serious cases a shorter haircut is recommended to remove the most compromised lengths and allow healthier hair to grow through.
Preventing future damage. A patch test and strand test before any colour service, a proper consultation that assesses hair condition before anything begins, and working with a colourist who diagnoses before designing are the most effective protections.
“I would like to thank Corey for such amazing work today. After five hours sorting out and correcting my colour I feel a million dollars. It is truly beyond my expectations.”
Gail Taylor  ·  NOCO Hair Bristol
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Written by
Noel Halligan
Co-founder and Senior Stylist  ·  NOCO Hair Bristol

Noel Halligan is a Bristol-based hairstylist and salon educator with over 20 years of experience in colour and cutting. As co-founder of NOCO Hair, he has developed a consultation led approach to hairdressing that prioritises diagnosis before design. He works with clients on complex colour transformations and trains stylists through the NOCO Academy.

Got a colour situation that needs fixing?
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