The functions and uses of rosin in Erhu are as follows:

1. Improve sound quality and vibration:

Increase friction: Apply rosin to Erhu On the bow, it can increase the friction between the bow and the strings, making it easier for the bow to control the vibration of the strings and produce a clearer and louder tone.

Improving the ringing effect: Rosin can promote the vibration and ringing between the bow and the strings, making the tone fuller and richer, and increasing the vibration and sustaining effects of the tone.

2. Enhance performance control:

Provide grip: Rosin can provide appropriate grip between the erhu strings and the bow, making it easier for the player to control the bow. Ensure note accuracy and stability.

Increase the portamento effect: Applying a moderate amount of rosin to the strings can help the player achieve a more precise portamento effect, increasing musical expression and variation.

3. Care and maintenance:

Protect bows and strings: Using rosin can extend the life of bows and strings. Applying an appropriate amount of rosin can protect the bow hair and strings from wearing out or getting old due to friction.

Prevents moisture and rust: Rosin helps protect bows and strings from moisture, avoid rust or deformation, and maintain their stability in different climates.

4. Usage tips and precautions:

Appropriate amount of use: When applying rosin, be sure to apply it in an appropriate amount. Do not apply too much, otherwise it may affect the sound quality and make the bow hair too sticky.

Regular cleaning and replacement: Regularly clean the strings and bow, and replace the bow hair to maintain the playing quality and tone of the erhu.

Rosin plays an integral role in erhu playing, not only providing improvements in sound quality but also helping players better master and control the instrument. At the same time, the correct use and maintenance of rosin is also an important part of maintaining the quality of erhu playing.