Rosin is a resin collected from pine trees all around the world. It is drawn from the trees in a tapping process in the same way that maple syrup is collected. A small area of the tree’s bark is removed and a drip channel and collection container is fitted, the tree is cut with V-shaped grooves which allow the resin to run out of the tree into the container. The resin is mixed with other tree saps and purified. It is then heated and melted and poured into moulds. After the mixture is set it is smoothed and polished and packed into containers.
The purpose of rosin is to make the hair grip the strings of the violin and cause them to vibrate. Without out rosin the hair would glide smoothly over the strings and no sound would be produced.
Before you can successfully rosin your violin bow you must know about the two kinds of rosin. The first kind is called dark rosin this is also known as winter rosin. Dark rosin is a softer stickier rosin and is suited to dry cool climates. Light rosin is harder than and not as sticky as dark rosin. Both will work fine on any violin you must experiment with different kinds until you find the type that is right for you.
Applying the rosin is very easy. Simply take the rosin and glide it several times up and down the bow. Remember to use the rosin sparingly most people use far too much this will cause the rosin to drip down of the strings and stain the violin.
You do not need to apply rosin everyday once every four or five times is enough after you have been playing a while you will develop a feel for how much rosin you need.