Take one of the 4 sections and apply KHS Keratin Smoothing System (Step 2) from 2cm from the roots to the ends. Do this for each section and comb though the hair to make sure the hair is evenly covered.
Straightens gently without stripping the colour out
It slightly fades the colour as it would - it is a strong chemical - but unlike the original you don’t end up with bright orange streaks going through your hair and you wanting to keep a bag over your newly straight, sleek but orange hair. So you can literally do this and leave a few days before colouring it again and nobody will know.