How do you apply semi permanent hair color?

The same way you would apply permanent start at the roots and section your hair to ensure all of the roots are done and then pull the colour through the rest of the hair to the tips. ensure that you have an even coverage and use all of the contents of the bottle (unless you have really short hair) and leave on for the time on the box. Make sure you get all of the odd bits of hair like sideburns and small bits of hair around your hair line.