Convert a StringValue with the name of a color to a color3 value?

hello, im trying to convert a brickcolor to a color 3 value but the name of the color is held in a stringvalue

        local c = colors[i].Value --this is where the string value of the brickcolor is
        button.BackgroundColor3 = BrickColor.c.Color -- this is how im trying to convert it

right now i get the error : attempt to call field 'c' (a nil value)

any ideas on how to do this?