Silicone in conditioner will make your hair feel nice initially, but the second you stop using it, your hair will return to the state it was in before you used the product. Brands that tend to have silicone: L’Oreal, Pantene, Garnier.
Sulfate in shampoo will strip unnatural color and dry out most hair types. In the event that you want a hair color out, sulfated shampoo will often do the trick. Sulfated shampoos generally are: Head N’Shoulders, L’Oreal, Pantene, Garnier, or any clarifying shampoo.
(Also, I learned the hard way that just because it says it’s for “colored hair” or “it’s organic” ect. , that does not mean its sulfate/silicone free! Look for sulfate/silicone free on the product you are considering!)