Please help! What is inside my teapot?

[mindytruong]

Hi everyone!

I was given this teapot long time ago. However, I didn’t know how to properly clean and care for a Yixing teapot. I have just heard about these things recently. And I realized there is something inside my teapot. Can anyone tell me what it is and how to remove it. It is hard to remove as I have tried using a clean tooth brush .

Thank you very much!!!!