I finally found some time to run the new OB chalk through a comparison test with Magic Chalk. I added the results to the
chalk comparison resource page.
OB chalk seemed a little harder and more abrasive than other chalks I've tested. Therefore, it might last a little longer and help keep the tip surface scuffed (but it could also wear down the tip faster).
Magic Chalk has surpassed all other chalks concerning how long the chalk remains effective on the tip (after multiple shots without chalking); however, OB also performed fairly well in this category (not as good as Magic Chalk, but better than other chalks tested).
Regards,
Dave