Around 3000 BC, blackboard writing appeared in the two river basins. For example, the blackboard writing of trigonometry written by Babylon appeared about 3700 years ago.
There are different opinions about the age of Egyptian papyrus and blackboard writing. One is that Egyptian papyrus and blackboard writing have similar historical periods; Another way of saying it is that the time of writing on the blackboard is about 4000-3000 BC.
Bayleaf Book started from the 7th century, and Indian people often write Buddhist scriptures with palm leaves, so Bayleaf Book also refers to Buddhist scriptures. Bay leaf can be found in some classical documents in China, but its origin time is not clearly recorded (perhaps unknown).
Bamboo Slips During the Warring States Period in China, bamboo slips were widely used to record characters in China. The Warring States period refers to the period from 475 BC to 22 BC1year, during which bamboo slips were used.
Personally, I think the time is probably: blackboard writing-Egyptian papyrus-bamboo slips-bay leaves.
(Without rigorous textual research, it may be wrong, for reference only)