What are the most common hair colouring mistakes?
The seven most common colouring mistakes are: box dye over previously-coloured hair, home bleach to save money, washing too soon after colour, using sulfate shampoo on coloured hair, going too light in one session, skipping bond builder during the service, and chasing Instagram colours on the wrong base. Each one makes the next service harder and more expensive.
After 15+ years behind the chair in the Sutherland Shire, these are the seven hair-colouring mistakes I see every single week — some from home dye jobs, some from other salons, some from clients following advice they read online. Every one of them is avoidable, and every one of them makes the next appointment harder (and more expensive). Here's what they are and how to stop making them.
Mistake 1: Box Dye Over Previously-Coloured Hair
Box dye contains a one-size-fits-all developer strength that doesn't know what's already on your hair. If you've had foils, balayage, or any professional colour, box dye reacts unpredictably — I've seen blondes turn green, brunettes turn orange, and previously-healthy hair come out like straw. If you need to cover regrowth between salon appointments, ask your stylist for a root tint take-home kit mixed to your formula. Safe, consistent, and won't wreck the colour underneath.
Mistake 2: Bleaching at Home to 'Save Money'
Home bleach damage is the single most common reason clients book a consultation. The maths never works out — a $30 home bleach kit that goes wrong turns into $400–$800 of colour correction over 2–3 visits, plus 6+ months of extra conditioning. I'd rather you booked a quarter-head foil package ($200ish) than touched a home bleach kit. Every time.
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Mistake 3: Washing Hair Too Soon After Colour
The first wash after colour sets how long the colour holds. Most people wash within 24 hours — colour pigments are still settling into the cortex for 48–72 hours after the service. Waiting 72 hours before the first wash, then washing with a sulfate-free shampoo, adds weeks to the colour's life. One small change, big payoff.
Mistake 4: Using Regular Shampoo on Coloured Hair
Sulfates (SLS, SLES) strip colour. Faster than sun, faster than heat, faster than anything else. If your shampoo lathers aggressively and leaves hair 'squeaky clean', it's stripping colour. Switch to a sulfate-free shampoo — we stock Juuce, Pure, and Aromaganic sulfate-free ranges at the salon. The difference in colour longevity is dramatic: 4 weeks vs 8–10.
Mistake 5: Going Too Light in One Session
Clients come in wanting to go from brunette to Scandinavian blonde in one appointment. It almost never works safely. Each lightening session lifts 2–3 levels; going 4–5 levels means bleach pushed too far, and hair that looks ashy the first week but feels like cotton candy by week three. Real platinum transformations are 2–3 sessions, 4–6 weeks apart. Any stylist who promises it in one session is prioritising the sale over your hair.
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Mistake 6: Skipping Bond Builder During Colour
A bond-building additive (Olaplex, Smartbond, or similar) mixed into bleach or colour is the single biggest hair-health upgrade of the last decade. It costs $20–$40 to add to a service and the difference in hair condition post-colour is night and day. If your salon doesn't offer it or charges $80+ for it, that's a red flag. We include bond builder in all our colour packages because not using it is cutting corners on hair health.
Mistake 7: Chasing Instagram Colours on Wrong Base
Pinterest and Instagram colour inspiration is amazing, but the photo you're showing me was taken on a model with a naturally level-7 blonde base, professional lighting, and a fresh service. If your base is level-4 dark brunette, achieving that exact photo takes 2–3 sessions and will look different in real light. I'll always tell you what's achievable and what isn't — and what the photo is hiding. Pick colour based on your own base, not someone else's.
A Quick Story: The Most-Common Fix
Composite of several clients I've seen: comes in after a home bleach and box-dye combo, hair orange-banded at the mid-lengths, platinum patches at the front, and brittle texture overall. We don't try to fix it in one visit. Visit one: cut off the worst damage, apply a colour-depositing toner to unify the tone, bond-repair mask. Visit two (4 weeks later): low-lights in the orange bands to restore dimension. Visit three (4 weeks later): final toner and gloss. Cost across all three: around $500–$700. Cost of the one-visit miracle a different salon quoted: $300 but with the damage doubled. Slower is cheaper and better. Every time.
Key Takeaways
- Box dye over professional colour is unpredictable and often damaging
- Home bleach kits almost always cost more than a salon service in the long run
- Wait 72 hours before the first wash post-colour for best longevity
- Sulfate-free shampoo is non-negotiable for colour-treated hair
- Real platinum transformations are 2–3 sessions, not one
Book a colour consultation
Learn more about this service or book your appointment today.
Frequently Asked Questions
What's the best treatment for frizz in humid Sydney weather?
A keratin-free smoothing treatment paired with a humidity-resistant leave-in works best for Sydney's changeable climate. Start with a gentle, sulphate-free wash, add a protein-balanced mask weekly, then seal with a heat-activated protectant before blow-drying.
How often should I tone blonde hair at home?
Every 1–2 weeks for maintenance, using a pH-balanced violet or blue-violet treatment, depending on your undertone. Keep dwell time short (3–5 mins) to avoid over-ash. Follow with a hydrating mask because toners can be slightly drying.
Keratin vs. smoothing: which lasts longer?
Keratin treatments (formaldehyde-free) generally outlast quick smoothing services, giving 2–4 months of frizz reduction with proper care. Smoothing services are gentler and great for first-timers or colour-treated hair, lasting 4–8 weeks.
