Those broads are retarded. That is iron not graphene. Iron oxides can be black, red, orange or yellow depending on the exact chemistry of the molecule. What they are picking up with the rare earth magnet is magnetite, a naturally occurring iron-based mineral that is abundant in the ocean. Graphene is one carbon atom thick sheets of graphite which is all carbon. If you have more than single sheets of carbon greater than one carbon atom think, then you just have graphite. Graphene is transparent. Graphite is black. Neither form of carbon are ferromagnetic and both occur in nature in massive amounts. Graphene oxide would be sheets of graphene with oxygen molecules on their surfaces. It's just a giant molecule of carbon dioxide. It's not a health hazards because it's not very reactive, non-toxic and non-carcinogenic. It's fucking carbon and oxygen- just like you are. The only real danger of graphene is as a potential breathing hazard due to it's size, but you would need to breathe in a significant quantity of it to be a problem. This applies to other materials like wheat flour or chalk dust. It's not the monster some people are making it out to be. Uneducated non-thinkers will always vilify something they are ignorant of. Graphene is their latest bogeyman. It's sad how they will spread fear and falsehoods with videos like this. They are easily debunked by even just a little research and knowledge on the topic.