Try looking for your g-grandfather in censuses from other states...a lot of Free Colored went from SC to GA and AL...so if you look in those states, as well as TN and even NC and VA, you might find him...That's all I know to tell you...Good luck..
Barbara E.

: my name is aimee colvin and I have been trying to find colvins in the slave
: data and census but I have come to a dead end. I found information on my
: grandfather but he was born 30 years after slavery in 1894.In Alabama.butI
: cant seem to find any record of him in the census. I'Ve been told by my
: father that my great-grand mother was a full blooded Indian.I dont know
: what race my great-granfather was could it be possible that my great
: granfather was a free man. If so, how do I began to search for him.