constructional material, plastic and rubber, ceramics Purpose of Ferric Oxide-RedColor up on rubber productions:type, inner tube, optional ... strap, bladder, tarp, plug of bottle and etc.Pigmentation and rust-guard against of oil paint and spray-paint:oil paint ... the frictional flake ,printing ink , magnetism material of ferric oxide and pigmentation of feeding stuff, food stuff and leechdom. ferric ...