General quiz about China 3

Intermediate level quiz about the geography, history, traditions and language of China (3)
1. Which one of these is not one of the four treasures of the scholar?
ink stone
chop (seal)
ink stick
calligraphy, Mifu, Song dynasty
Calligraphy by Mifu (c. 1097), Song Dynasty, Jiangsu province. Image by Naus available under a Creative Commons License
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