1, wipe again and press gently.
The so-called "re-rubbing" does not mean rubbing with gravity, but requires a key rubbing, which is actually rubbing with a little force. "Soft pressure" refers to holding the back, that is, holding rosin to exert pressure on the arch hair. Light pressure means that the pressure exerted on the arch hair should be appropriately reduced when rubbing rosin.
2. From beginning to end
The so-called "end", every time rosin is rubbed, it must be rubbed to the tip and root of the bow; "To the edge", rosin should be rubbed to the inside and outside (up and down) left and right sides of the bow hair. Generally, the internal and external (up and down) rubbing can basically reach the left and right sides. If it is not enough, it should be wiped again.
3. Fully knead for the first time
When the new bow is rubbed with rosin for the first time, it must be fully rubbed at one time. Because the first application of rosin is laborious and time-consuming, it is common that someone grinds rosin into powder with tools, and then scatters or rubs it on the bow hair. The rosin powder made in this way is uneven in thickness, not easy to hang incense on the bow hair, and it is dirty, unscientific and undesirable.
4, frequently wipe evenly
Erhuqin bow rosin should be rubbed frequently, usually once every 2-3 hours, or once according to the need that the friction of bow hair becomes smaller, and it is enough to rub it back and forth from beginning to end every time. Every time the rosin is rubbed, the force must be even, the arm holding the rosin can run easily and smoothly, and the rosin is constantly rotated to wipe the arch hair evenly, and the surface of the rosin is ground into a gully, which is not only economical and beautiful, but also ensures the fineness and uniformity of the rosin powder.
Extended data
Rosin is coated on the bow hair of erhu, violin and other musical instruments to increase the friction between the bow hair and the strings. Refined transparent block rosin is the best, and it can also replace the natural crystalline rosin secreted and solidified by Chinese pine.
The popular method of beating rosin is to split a piece of bamboo in advance and then add rosin. Then, the bamboo pieces were lit with fire, so that the rosin was scalded and dripped on the piano barrel. This method is called "burning incense". Although burning incense is convenient and easy to play, it hinders the performance of some bow-carrying techniques, and the piano barrel and piano skin are not clean enough.
Now rubbing incense is more popular, that is, rubbing rosin directly on bow hair repeatedly. After rubbing rosin once, this situation will last for at least one hour. Practice has proved that the sound of the piano just after "rubbing incense" is not very ideal. It takes two or three minutes for the piano sound to gradually return to normal. When rubbing incense, don't use too much force to avoid breaking the bow hair.
Without rosin, the bow will be very slippery when playing on the strings, and no sound will be made. With a little rosin, the bow hair will have some stickiness, and when playing, it will "catch" the strings and make them vibrate and make a sound. Rosin is wrapped in cloth or a small box when it is bought back. It is not only sticky but also hard. Usually it can be used for a long time. The harder rosin is, the easier it is to break.