Whether you use a boxed hair colour at home or you get it done professionally at a salon, the recommended wait time before washing your hair is 24 hours. If you use a double-process colour (such as a base colour and highlights), try to go 48 hours without washing your hair to allow your hair and scalp to build up their natural oils again.
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If you have unexpected results such as an overly vibrant, dark or ashy colour, the professionals at Schwarzkopf (a leader in the hair colour industry) suggest washing your hair immediately.
Wait a minimum of 24 hours after any colour process for best results, unless you want to tone down the colour-in, in which case wash it immediately. Always follow up with a deep conditioner to restore moisture to the hair.
The first day after colouring is your best chance to get rid of it, if you change your mind about the colour.