I had purple balayage done at my hair salon but the colour had faded almost completely. I was recommended crazy colours to maintain/restore the colour. I got the shampoo, conditioner and both the red and purple power drops as I wanted more of a red than a blue purple colour. They've worked brilliantly, I really like being able to make my own shade. I tried adding the drops to just the conditioner initially but the effect was subtle so I added it to the shampoo on my next wash and that was much more effective