Cai knew some ironsmith that was in charge of an iron foundry.
Cai quickly took a job with emperor Hu.
Many inventions wither away into obscurity and fail to become lasting innovations until the right person with the right vision, means and connections comes along.
Before his invention, the Chinese used bamboo and wooden slips to write.
This process was known as Cai Lun paper.
Cai Lun was full of experience and versatile since childhood.