I have very short platinum blonde hair and I want to dye it a deep brown. My natural color is medium blonde/lightbrown so my brows will be lighter. Also, I only tweeze to "clean up" my brows but they naturally grow pretty thin. DOes this castor oil thing work? Is it safe to use around your eye? Has anyone else done it? Or should I just dye my brows darker too? Is there anyway to grow dark strong eyebrows naturally or do you have to be born with them?