Dark hair has more Pigment in the hair than lighter hair. Before we can even look at getting to an undercoat of a yellow (which is the undertone we like to go for)
we first have to look at lifting all those darker/warmer pigments out. Lifting the hair out to an undercoat of pale yellow is the best 'foundation' to achieve a nice ash tone without the warmth. This is why most of you with dark hair will need to have your hair prelightened prior to applying a target shade to achieve the end result.
Most people with dark hair usually only lift out to an orange undercoat max and this is why the overall result will look darker. Ash tones normally look darker as they are matte colours. However this is the only way to get rid of warmth and why it is often required to carry out another or multiple bleaching sessions. This makes it harder to determine the end result and everyone's hair is different. Some have fine hair, some have thick hair, resistant hair etc which also contributes to any factors when colouring the hair.
This is why at times it's best to stick to a colour result which is more achievable and realistic and aim for something that is more suitable and low maintenance. Being blonde or ash blonde comes with high maintenance if you want your colour looking fresh. After a blonding/lightening service I always recommend coming back every 6/8 weeks for a toner and cut to keep the hair looking fresh and healthy.
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