It might be easier to lighten up in stages, so start with some highlights. This also gives you a chance to get used to being lighter.
Use a gentle colour that contains organic ingredients where possible and contains no ammonia.
Generally speaking, going lighter is more damaging than going darker, so you need to give your hair lots of replenishing treatments. Hair either lacks moisture, protein, or a mixture of both. To test the condition of your hair, you can do the “stretch test”. Take about 10 strands of hair and spray with water, hold the hair firmly between both hands and gently pull the hair away from the head, healthy hair should stretch about 30% of its length and then return like an elastic band showing no signs of damage. Hair that stretches and returns is healthy, hair that stretches and does not return to its previous length is weak in protein, hair that doesn’t stretch is low in moisture.
Make sure a full blonde change is practical to upkeep. If you have an all over blonde, your roots will need doing every 4 weeks or so – have you got the time and money to do this? If not, go for highlights that are more broken up at the scalp – regrowth is disguised for longer.
Blonde hair needs to be cared for properly or it’ll go brassy. Wash once a week with a special blondes shampoo, such as Organic Care Systems Silver Shampoo. Look out for shampoos that are tinged blue or purple – these are best for counteracting any yellowing.