The news about movable type printing that Zhao Hanzhang cared about spread to book offices everywhere. Not long after, the Luoyang Book Office brought good news: after relentless research efforts, they finally developed copper movable type. Currently, 286 copper movable type characters have been successfully cast, with each character cast nine times, making it barely possible to piece together a book.
Zhao Hanzhang was overjoyed and immediately instructed to accelerate the casting process.
Soon after, good news also came from the Yu State Book Office. Through continuous research, they had mastered relatively stable porcelain movable type and sent a set over.
Hu Jin did not disappoint Zhao Hanzhang. He tried several materials; wooden movable type proved unstable, and even if characters were made, they'd crack after few uses due to excessive wear;
Clay movable type was difficult to manage temperature-wise and tended to break during casting, making it hard to shape;
