What does 6 10 special broken coin mean?

6 10 special damaged currency refers to the RMB that is damaged in appearance, texture and anti-counterfeiting features due to special reasons such as fire, moth-eaten, mouse bite, mildew, etc., and the paper is carbonized and deformed, and the pattern is unclear, which is not suitable for further circulation. Because these RMB are not artificially damaged, but are damaged due to special reasons such as natural weather and animals, they are called 6 10 special damaged coins. Under the condition that the special damaged currency is not seriously damaged, it is easy to accurately judge whether the reserved area is full or half, and the reserved part will not be worn to the exchange standard due to counting and binding, so it can be exchanged as ordinary damaged RMB and sandwiched in ordinary damaged coupons.