In the world of hair coloring, developer is used to, well, develop the color - it helps to open up the hair cuticle and allow the color to penetrate. Conditioner, on the other hand, is used to moisturize and nourish the hair. So, while they might seem like similar products, they actually have very different purposes!
Now, I know what you're thinking - but what if I just use conditioner instead of developer? Well, let me tell you, it's not going to give you the same results, and it might even end up damaging your hair! Conditioner just isn't formulated to help the color penetrate the hair in the same way that developer is.
