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What are the two types of artificial blood? And what are the two stages of blood seperation by centrifugation? Thanks so much. Please include websites if you use them?

At the very start, they are at the quidditch cup and Winky, Barty Crouch's house elf is sitting on a seat, claiming to be saving it for her master. It is later revealed that Barty Crouch Jnr was there under the invisibility cloak. As there were no other seats and Winky was there the whole time...