SOY4PLEX leaves hair deeply conditioned, with up to 61% more reflective shine, multi-dimensional colour and long-lasting results. Deep Conditioning SOY4PLEX is a deep conditioning colour complex that acts on both the outer layer and deep inside the cortex to deliver the 4 signs of healthy-looking colour.Reflective Shine. The deeply conditioned outer layer forms a highly reflective surface for noticeable, healthy shineA—up to 61% more.