So, I know viruses don't have a color because they're too small to interact with visible wavelengths of light properly. I also know they're so small that getting any real mass of them would be functionally if not outright impossible.
That said: what if I did somehow get a visible amount of pure virus? Like I've gone through a country during flu season with some kind of magic beam and extracted a milliliter or so of pure flu virus- an amount where you can put it in a little vial and easily view with the naked eye that there's a substance in there. Would that have a color then? Do we know?
Edit: also, new question. Would a pile of viruses stay in a pile? A single virus, not contained in any kind of liquid droplet, is so tiny- could gravity even pull a single virus down, if I managed to take one single virus out of the vial and place it in the air?
Because if it can't pull a single virus down, I'd expect a pile of em to drift off in all directions. Unless they stick together, I suppose- those sort of alien-robot-shaped bacteriophages in particular look like they'd tangle pretty effectively.
(For the purposes of the first question, we'll imagine the vial is full and capped, so whether or not gravity would keep em in the vial isn't relevant.)