How does Conan know that something is cut recently?


In many episodes, Conan sees a tree branch or a rope and after a quick look,
he states that it is recently cut which means it is done by the culprit.

How does he know that?




A cut rope or branch (or any piece of wood) will start to discolor almost
immediately. If you know what a fresh cut and non-recent cut look like it is
not difficult to spot anything in between.




A cut rope or branch (or any piece of wood) will start to discolor almost
immediately. If you know what a fresh cut and non-recent cut look like it is
not difficult to spot anything in between.

