How To Prepare Your Hair For Bleaching & Colouring
Going blonde is exciting — whether you’re after a soft balayage, sun-kissed highlights, or a bold platinum transformation. But bleaching is a chemical process, and your hair needs to be in the right condition to handle it. Preparing properly is the difference between walking out of the salon with silky, glossy blonde locks or ending up with breakage and dryness.
So, how do you prepare hair for colouring or bleaching? In this guide, our expert stylists explain the best way to prepare hair for bleaching, what to avoid beforehand, and how to keep your hair healthy before, during, and after your appointment.
Why Preparation Matters
Bleaching hair involves lifting your natural pigment using peroxide and bleach powder. This process opens up the cuticle, strips out colour, and leaves the hair more porous. Done well, it creates a beautiful blank canvas for blonde, pastel or vivid tones. Done without preparation, it can leave strands fragile and prone to breakage.
That’s why stylists stress: if you’re wondering how to get hair ready for bleaching, it’s not just about showing up at your appointment — it’s about what you do in the weeks beforehand.
Should You Wash Your Hair Before Bleaching?
It might seem counterintuitive, but freshly washed hair isn’t ideal. We recommend washing your hair two days before your appointment.
Why? Your scalp’s natural oils create a protective barrier, helping shield your strands from the harsh effects of bleaching hair with bleach. If you arrive with squeaky-clean hair, you’re removing that natural defence.
How to Prepare Hair for Bleaching: Step by Step
If you’ve booked a lightening service, here’s how to prepare in the weeks and days before:
1. Honestly Assess the Condition of Your Hair
Before asking how to prepare dark hair for bleaching or how to bleach curly hair, first assess your hair’s health. If your hair is very dry, brittle, or chemically damaged, hold off. Instead, spend a few weeks rebuilding strength with nourishing masks and bond-repair products.
- For damaged hair, try a restorative treatment like Keune Care Vital Nutrition Mask — it strengthens, hydrates, and prepares fragile strands for chemical services.
- For coloured or highlighted hair, let old dye grow out to avoid uneven results.
If you’re unsure, book a consultation. Our stylists will tell you honestly if your hair is ready or if you’d benefit from a prep phase first.
2. Put Down the Heat Styling Tools
In the two weeks leading up to your appointment, avoid straighteners, curling wands, and even blow-dryers if you can. Heat strips moisture and weakens the cuticle — not what you want before exposing it to bleach. Air-dry wherever possible.
3. Moisturise and Strengthen Your Hair
If you’re wondering how to prepare damaged hair for bleaching, hydration is your best friend. In the fortnight before, add weekly masks and oils:
- Keune Care Vital Nutrition Porosity Filler: perfect for smoothing and strengthening porous hair.
- Keune Care Satin Oil Treatment: lightweight nourishment that restores shine and moisture.
Massage oils into the scalp as well as the lengths to boost hydration and circulation.
4. Be Honest With Your Colourist
When considering how to prepare for a hair bleaching appointment, honesty is key. Tell your stylist if you:
- Have old box dye or colour still in your hair.
- Recently used henna or other treatments.
- Have had chemical services such as perming or straightening.
This information helps us decide the safest approach. Sometimes, reaching your desired shade takes more than one session — especially if you’re starting with darker hair. Slow and steady lightening is always healthier than rushing to platinum in a single sitting.
5. Special Considerations for Different Hair Types
How to prepare dark hair for bleaching:
- Dark hair often requires multiple sessions. In the weeks before, strengthen with protein masks and avoid overlapping dye or box colour, which can complicate lifting.
How to prepare curly hair for bleach:
- Curly textures are naturally drier. Focus on moisture-rich products like Keune Care Curl Control Mask to lock in hydration before your service.
How to prepare damaged hair for bleaching:
- If your hair is fragile, don’t rush. Book treatments like Olaplex or Keune’s Bond Fusion alongside your colour appointment — they rebuild broken bonds and reduce further damage.
Aftercare: Upgrade Your Routine
Once your colour is done, your journey doesn’t stop there. Bleached blonde hair needs special care to stay bright and healthy.
- Switch to purple shampoo: To keep brassiness at bay, use Keune Care Silver Savior Shampoo.
- Use nourishing conditioners: Pair with Silver Savior Conditioner for softness and shine.
- Weekly treatments: Replenish moisture with Keune Care Vital Nutrition Mask.
For more aftercare tips, see our guide on how to keep highlighted hair from fading.
Bleaching Hair: What to Expect at the Salon
When you sit down with your stylist at Strand & Lock, here’s what will typically happen:
- Consultation: We’ll discuss your goals, hair history, and the safest way to achieve your blonde.
- Strand Test: Sometimes we’ll test a small section first to check how your hair reacts.
- Lightening Process: Applying with bleach carefully and evenly, often in foils.
- Toning: After lifting, we’ll apply a toner to achieve the exact shade of blonde you want.
- Aftercare Plan: We’ll recommend products and book your next appointment to keep your blonde looking fresh.
How to Prepare for a Hair Bleaching Appointment: Quick Checklist
- Wash hair two days before (not on the day).
- Stop heat styling at least a week before.
- Nourish hair with masks and oils.
- Avoid colouring or perming right before bleaching.
- Be honest with your colourist about your hair history.
Ready to Go Blonde? Book with Strand & Lock
Bleaching is a big change — but with the right preparation, it can be a beautiful one. If you’ve been wondering how to prepare hair for bleaching, prepare hair for colouring, or even how to prepare curly hair for bleach, our expert stylists can guide you through every step.
At Strand & Lock, our team are trusted for their expertise in lightening services across South London. Whether you’re looking for a skilled hairdresser in Bermondsey or hairdresser in Borough, we’ll make sure your journey to blonde is healthy, stylish, and tailored to you.
✨ Book your bleaching and colouring appointment today and let us help you achieve the blonde hair you’ve been dreaming of.
Dasos Anastasis is the owner of Strand & Lock, a premium London hairdressers with salons in Bermondsey and Borough. His passion for hair began in the 1990s when he joined his father’s barbershop. With over three decades of hands-on experience, Dasos continues to bring craftsmanship, tradition, and innovation together to redefine the hair industry.
