Although, in a way, it seems like posting naked pictures of myself, here’s what 515 grams of my own plasma looks like, freshly centrifuged out of my blood across the street at Canadian Blood Services:
Every time I donate it runs the same way: after about 30 minutes of paperwork (“Have you ever had sex with anyone who has received money or drugs for sex?” and so on), I get hooked up to to the Haemonetics PCS2 machine. The machine sucks out a bunch of my blood, whips it around and magically takes out the plasma, puts my blood back (that seems the most unlikely process of all), and then repeats. Here’s how Haemonetics explains it on their site.
Apparently some people can get their allotted due of 515 grams in two go-arounds; I always seem to take 3. In general I’m in and out in about 90 minutes; sometimes it takes two hours, especially if I linger for an additional chocolate chip cookie.