Melanin produces brown and black. Melanin is broken down into eumelanin, black and pheomelanin, brown.
Sorry to pick on you Ken! I just love genetics and pigments, I picked up most of my info when researching rat colours and bird mutations.
In case you guys wonder how melanin produces browns and blacks. It's based on the shape. Eumelanin is round and pheomelanin is kind of kidney shaped. Light reflects back differently from the pigments and thus produces the colour. Shape of the hair shaft also affects colour, but mostly tint.