Lightening hair at home may seem like a simple way to change your appearance, but the process involves chemicals that can leave hair dry, brittle or uneven when used incorrectly. With box dyes, bleach products and online tutorials widely available, many people attempt the process without fully considering their hair's existing condition or colour history. Hairdressing expert Samantha Kochhar, Managing Director of the Blossom Kochhar Group of Companies, has highlighted nine common mistakes people should avoid when trying to lighten their hair themselves.

The first mistake is failing to consider the starting colour and condition of the hair. Dark hair cannot always be transformed into a very light shade in a single session without the risk of unwanted orange or uneven tones. Previously dyed or chemically treated hair can also react differently from untreated hair. Kochhar also cautions against automatically choosing the strongest bleaching product, as a stronger formula can increase the risk of dryness, breakage and other damage if it is not appropriate for the hair.

Skipping a strand test is another common error. Testing a small section beforehand can help determine how the hair reacts to the product, how quickly it lightens and what kind of result can be expected. Application technique is equally important. Hair should be divided into sections to ensure the product is distributed evenly, while extra care is needed around the roots because the warmth of the scalp can cause them to process faster than the lengths.

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Overprocessing is another mistake that can seriously affect hair quality. Leaving a lightening product on for longer than recommended does not necessarily produce a better result and can instead leave the hair increasingly dry and fragile. Hair care should also continue after the lightening process. If hair is already damaged or rough, chemical lightening can worsen the condition, making regular hydration and restorative care important after treatment.

Kochhar also advises people not to expect dramatic colour changes overnight, particularly when starting with dark hair. Achieving a significantly lighter shade may require more than one session, with time between treatments allowing the hair to recover. Another frequently overlooked step is toning. Yellow or orange tones can appear naturally after hair is lifted, and an appropriate toner can help neutralise unwanted warmth and create a more balanced final shade.

Finally, Kochhar warns against relying blindly on random advice from social media or online tutorials. Hair texture, previous treatments and individual colour history vary, so a method that works for one person may not produce the same result for another. A careful approach, appropriate products, strand testing, controlled application and proper aftercare can help reduce the risk of damage. For significant colour changes or hair that has already undergone chemical treatment, seeking professional guidance can be the safer option.

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