Yes. Strand testing is when hair dye is applied to a small section of hair to test the results before it is applied to the entire head. Conducting a strand test is an easy way to see the results of the hair dye on your starting hair colour, whether it is natural or already coloured. Testing your chosen colour on a small section of hair is also a way to establish the appropriate processing time for your hair, using the times listed in the Instruction Leaflet as a guide. Strand testing directions are listed within the Instruction Leaflet included in each pack of hair colour.