Washing your hair after applying toner depends on the specific toner you are using and the desired result. If you are using a toner that is designed to be left in the hair, you should follow the instructions provided by the manufacturer. Some toners are meant to be washed out after a certain period of time, while others can be left in for longer periods.

If you are using a toner that is typically washed out, it is generally recommended to wait at least 24 to 48 hours before washing your hair. This allows the toner to fully penetrate and work on the hair, resulting in a more effective outcome. Washing your hair too soon after applying toner may diminish the desired effect.

However, it is important to note that the specific instructions provided by the manufacturer should always be followed. Different toners may have different requirements and waiting times, so it is best to refer to the product packaging or consult with a professional hairdresser for guidance tailored to your specific toner.