In China, writing brushes, ink sticks, paper and ink stones are called the Four Treasures of Study.
在中国，毛笔、墨、纸和砚台被称为文房四宝。
After artificial ink-sticks appeared in Han, pestle gradually disappeared.
在汉代出现了人工墨之后，杵逐渐消失。
Since the Han Dynasty (206 BC - 220), ink sticks have been made from pine soot, using other procedures that include mixing with glue, steaming and molding.
自汉代(公元前206 - 220)，墨已经从松烟，使用其他程序，包括拌胶，蒸成型。
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