Almost all iron ores are oxides, essential precursors to iron metal and many alloys. Iron, or ferrous oxide, is a chemical compoundof iron and oxygen. It is a black-colored powder that is sometimes confused with rust. Among their many advantages, they are intensely colored and non-toxic.
Why Ferro?
It is the only material with strong magnetic features and is solid and black after oxidation. What we can do with those black magical particles is to build magnets and ferrofluids.

Will you become a Venom character?
The meaning of venom is a poisonous substance secreted by animals such as snakes, spiders, and scorpions and typically injected into prey or aggressors by biting or stinging.
The science fiction character Venom is a sentient alien symbiote with an amorphous, liquid-like form that survives by bonding with a host, typically a human. This dual-life form receives enhanced powers and usually refers to itself as "Venom."
With ferrofluid, you will not; iron and mineral oils are organic natural components. What you can do is experience magnetic ferrofluid skin.