Semi-permanent hair colouring usually lasts for eight to 20 shampoo applications, yet factors such as the condition or porosity of your hair, the quality of the semi-permanent colouring and your hair texture affect the length of time that colouring naturally fades or is removed. However, you may apply a semi-permanent colour to your hair and decide to remove it the day after application. Removal of the semi-permanent colouring is not recommended in one day; however, there are some steps that you can follow to attempt removal of colouring.
Shampoo your hair as many times as possible using very hot water and a shampoo high in sulphur content. After several washings, you should notice the colour fading.
Use hot oil treatments to strip semi-permanent colouring from your hair follicles. Since the condition and type of hair affects this procedure, you must pay attention to the effects of Step 1 and Step 2 on your hair. If you notice colour fading with the hot oil treatments, continue to apply and rinse hot oil from your hair; however, if you do not notice any fading, continue on to Step 3.
Apply dish washing liquid or liquid washing powder to your hair. These agents will remove semi-permanent colour and dry out your hair, so you should use either conditioner or hot oil treatments in between wash and rinse cycles.
Soak your hair in lemon juice and vinegar for 10 minutes if you have had the semi-permanent hair colour on your hair for at least one week. It is not a safe to apply lemon juice and vinegar to your hair within 24 hours of a semi-permanent colour application. Your hair will turn green, and you will have to seek a hair care professional if your hair becomes severely damaged.