As one of Four Treasures of the Study, were all ancient inks black?

Ink means black, but ancient ink is not only black, but also colored ink of other colors. The size of ink is generally 26 ingots.

The main raw materials of ink are soot, pine smoke, glue and so on. Carbon exists in amorphous form. Ink written with a brush can be produced by grinding an inkstone with water, and it exists in water in the form of colloidal solution. The main factions in Gu Mo are Huimo and Mo Chuan.

The development history of Mexico

Before the invention of artificial ink making, natural ink or semi-natural ink was generally used as writing material. Ink was invented about later than pen. Prehistoric painted pottery patterns, Shang and Zhou Oracle Bone Inscriptions, bamboo slips, silk paintings and so on have left traces of original ink everywhere.

According to documents, ink was also used in ancient ink punishment (face painting), ink rope (carpenter's use) and ink turtle (divination). Archaeological excavations in China found bones and ink on stone tools in the14th century BC, and ink blocks in the Warring States Period were also unearthed from Yunmeng County, Hubei Province. There is a phrase "licking pen and ink" in Zhuangzi, which shows that in the Spring and Autumn Period and the Warring States Period, brush and ink were already used.