The corian marble sink is dyed pink, how do i make that go away?
First, Corian is not marble. Corian is not stone. It is a man-made surface that can stain somewhat easily.
However, you may be able to bleach it some and you may have some luck following the same procedures for removing stains from stone found in the Removing Stains Manual which will be easy and cheap to do.
However, if the stains are deep you may have to have the sink professionally repaired. Corian can be "sanded" some to remove blemishes and this can work if stains aren't too deep, but if a large area I'd call Corian and get a reference for a pro in your area.