I have some Clarity brand rosin that seems like it has gotten old and hard. I’m not sure that I’m getting enough rosin on the bow. Is there a way to revitalize Clarity rosin? Thanks
You might try gently scoring it with a knife in a "tick-tack-toe" pattern (square grid) to loosen some small particles and give the bow a better grip on the rosin cake.
Bassists sometimes use a small drop of alcohol on a paper towel in a sealed container with the rosin for a period of time - I’d recommend an hour.
The Clarity brand of rosin is a synthetic substance that is not rosin, and I do not believe that it is soluble in alcohol.
One of the things you can do is scuff up the surface with some sandpaper. Check out my article on rosin at: https://adbowsllc.com/2018/09/25/all-things-rosin/