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Fading Bookmark is a bookmark concept which is able to remind you the time limit of your borrowed book by its fading green color. The leaf-pattern on the top of the book mark will oxidize as time passes and slowly turn green to gray. When the leaf is completely wilted, it is time to return the book to the library. Every time a new book is borrowed, you can cover the leaf with the paint, so that it will turn green again and restart to oxidize, letting you know the time limit. Therefore, books are more possible to be returned on time.
Yihuan Gu|Jiayao Liu|Xiaoshi Ye|Yin Sha|Weihang Shu