Rosin the bow. Rosin comes in two types, dark and light; either is fine to use, and neither is expensive. In warmer climates, light is preferred, dark is recommended in more northern areas. If you live in an unpredictable climate, it is advisable to have both. It's usually a rectangle of hard, translucent material in a paper or cardboard casing that's open on two sides. Grip the rosin by the papered sides and gently but vigorously rub it up and down along the length of the bow hair three or four times. The goal is to transfer some of the rosin “dust” onto the hair, making it stickier. You will need to rosin your bow about every time you practice.
