There are two main ones, ammonia and bleach. Ammonia reveals the follicle of the locks base so large substances can enter. Hydrogen bleach substances the locks so that new colour can be added to create the desired colour. Some lasting colours come with more organic ingredients than others, but will likely still have some artificial substances as well.demi-permanent locks colour - The colour substances are again very small and they go through into the cortex. Here, they incorporate with each other to form bigger substances. Therefore they don't wash out as quickly, lasting through a couple dozen hair shampoos. This type of shading includes some bleach, which enables it to slightly reduce the organic colour and combination better with current greyish.