Around 1450, Johann Gutenberg was the first to bring together the complex systems and subsystems necessary to print a typographic book, including a thick, tacky ink that could be smoothly applied and did not run off the metal type; a strong, sturdy press; and a metal alloy that was soft enough to cast yet hard enough to hold up for thousands of impressions. But the key to his invention was the used for casting the individual letters.

Type mold

Explanation:

Around 1450, Johann Gutenberg was the first to bring together the complex systems and subsystems necessary to print a typographic book, including a thick, tacky ink that could be smoothly applied and did not run off the metal type; a strong, sturdy press; and a metal alloy that was soft enough to cast yet hard enough to hold up for thousands of impressions. But the key to his invention was the type mold used for casting the individual letters.

answer: you could try asking a family member maybe?

the answer should be monarchy