Colour Correction: What It Is and What to Expect

Colour correction is one of the most complex services in the salon — and one of the most misunderstood. Whether your hair has turned an unexpected shade after a box dye, gone brassy after highlights, or ended up uneven after multiple colour services, colour correction is the process of fixing it. Here is what it involves, why it takes time, and what you need to know before booking.

The term colour correction covers a wide range of situations. It might mean removing unwanted warmth from lightened hair that has gone too orange or yellow. It might mean evening out patchy or uneven colour caused by overlapping colour applications. It might mean lifting hair that has been repeatedly darkened with permanent dye, or correcting a colour that was applied at home and did not turn out as expected. Each scenario requires a different approach.

Box dye is one of the most common causes of colour correction appointments. At-home colour formulas are designed to be universal — they do not account for your specific hair type, porosity, or existing colour history. Over time, box dye builds up on the hair and creates a dense, resistant layer that professional colour has difficulty penetrating or lifting evenly. Correcting hair with heavy box dye history typically requires more time, more steps, and sometimes multiple appointments.

Colour correction is almost always a multi-step process. Depending on the situation, it might involve removing existing colour with a colour remover or lightener, rebalancing the underlying tone, applying a new colour or toner, and finishing with a bond treatment to restore the hair's condition. Each of these steps needs to be done carefully to avoid further damage — which is why rushing colour correction is never a good idea.

Multiple sessions are often necessary. If your hair is very dark, heavily processed, or significantly damaged, trying to correct everything in one appointment risks the integrity of the hair. A responsible stylist will prioritize the health of your hair and spread the work across two or more appointments if needed. The end result will be stronger, more even, and longer-lasting than if everything was pushed into one session.

Pricing for colour correction reflects the time, products, and skill involved. It is generally more expensive than a standard colour service, and the final cost can vary significantly depending on the amount of work required. A thorough consultation before the appointment is essential — it allows the stylist to assess the situation, set realistic expectations, and give you an accurate estimate.

If you are considering colour correction, the most important thing you can do is come in for a consultation before booking a full appointment. Bring photos of your current colour and the result you are hoping to achieve. Be honest about your colour history — including any box dye, home highlights, or previous professional colour — because this information directly affects the plan. The more your stylist knows going in, the better the outcome will be.