This happens most of the time to the mouthpiece after its used frequently. Or it might just be the fact that its scratched from the ligature....Hope this helps!!
"His concern For light on the sculpted surface." was one of the aspects <span>of Rodin's work that ties him to impressionism. Auguste Rodin was a famous sculptor and painter from the country of France wherein he uses the impressionist's artistic movement which highly emphasises the importance of lighting.</span>