I have a client booked in for roots she previously went to another salon that used inoa colours as she would have a reaction to other colours. I have specially bought in the colour and developer for her to gain her as a client. We are currently changing colour manufacture and will skin test her for a new range of oil based colours however in the meantime will use the inoa on her. My question is do I need to purchase the post service shampoo or will other brand of post service shampoo and conditioner be suitable? As I can’t afford to be paying out too much for just one client. Thank you