I recently got some rosin from my luthier’s (my old rosin was grooved so badly that it was tearing out bow hairs every now and then). They didn’t have a whole lot of options, really: just light and dark. I’m not sure why, but my violin teacher really prefers the dark rosin. The box that it came in says that it’s supposed to have very little dust. I’d agree with that, but unfortunately it’s so new and shiny that I feel like I can’t get it off the block and onto my bow! As a result, I do tend to rosin every time I practice. I know that some people only put it on once every week or two, but I’d rather have extra rosin on my bow as opposed to not enough.