Alice ( A013 ) Rosin Colophone Friction Increasing Resin For Violin Viola Cello Bowed String Instument

The gum-like substance in rosin is applied to the bow in order to generate friction between the strings and the bow. It improves the resonance of the instrument. Without rosin, the bow’s bristles would slip and wouldn’t be able to rub the strings with enough friction to produce a sound