There are plenty of videos on Winogradsky columns...this one is pretty good.
Funny thing, though: All the videos use the same procedure. One if the great things about these columns is that there is no correct way to do it. A variety of procedures may produce a variety of results. Why not change it up a bit, like we did?
Seems they do them at Bronx Science, too, but again, with the same procedure. See how this terribly easy project is made to seem so difficult. But the girls are amusing: