Simon Clark hairdressing show why you should not use a hairdryer on foils

Why using a hairdryer to speed up your foils is not so clever

Using a hairdryer to  heat up foils , well what can go wrong?

Simon Clark hairdressing show why you should not use a hairdryer on foils

Using a hairdryer on foils and the car crash that follows

As hairdressers, we’ve all been there. Our client’s foils, just are not lifting fast enough and we are about to run behind. The solution is simple, heat up the client’s foils. So either you get suck under a dryer or the assistant gets to stand waving a hairdryer at your foils. Either that or you run late. If you are very lucky you will be able to use a climazon which uses infra red lights to gently heat the hair in a controlled manner.

The Science behind it

So how does it work? As general rule for every 10 °C you increase the temperature the reaction rate will double. If you want the science, the collision theory, says that reactions happen when molecules collide with each other. Heating them up, makes the molecules move faster and thus, more likely to collide with each other. Think of driving a car. The faster you drive the more likely you are to have an accident.

Now with your hair colour this is all hunky dory. In a basic sense ammonia opens up the hair shaft letting the peroxide and dye into your hair. The peroxide then joins the dye together to colour your hair. Warm the hair up 10 °C and your client only needs to sit half the time.

The optimum temperature for a hairdryer is 107 °C allowing for the air to cool to 60°C when it hits your scalp. So lets be conservative and say the hairdryer increases the temperature of the foils 30°C or doubles the reaction rate 3 times (23). Meaning the colour reaction in your hair is now proceeding 8 times faster than its meant to. Now imagine the peroxide, that was out for a quiet drive, looking for hair colours to join together. Speeding through your hair, 8x faster than its supposed to be going. It stands to reason that it is going to have an accident!

You really can rust your hair

Next we have some iron molecules that have settled in your hair, quietly minding their own business. Now along comes Mr Peroxide speeding out of control, thanks to the hair drier. In the ensuing crash some iron oxide (rust) is formed. Rusting your hair, giving you the subtle yellow or wonderful burnt orange shade of rust. Which once in your hair is impossible to shift.

The other problem, is just like driving your car to quickly will wear its parts out faster. So pushing the pace of your colour development will cause more damage too. As in all other areas of life speed comes with a price. Our advice rather take your time, as with the tortoise, slow and steady always wins.

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