Keeb kwm kev loj hlob ntawm Tin Bronze

Thaum ntxov li 3000 BC, cov neeg pib tsim thiab siv tooj. Txawm li cas los xij, cov khoom siv ua los ntawm cov tooj liab smelting yog muag dhau, khoov yooj yim, thiab ua sai sai ua npub. Tom qab ntawd nws tau tshawb pom tias cov tin tau sib xyaw rau hauv tooj liab los ua tooj liab-tin alloy-bronze. Cov khoom siv tooj dag tau yooj yim dua rau smelt thiab ua dua li cov tooj liab ntshiab, thiab nyuaj dua li tooj liab ntshiab (yog tias qhov nyuaj ntawm tus nqi ntawm tin tau teeb tsa 5, tom qab ntawd cov hardness ntawm tooj liab yog 30, thiab lub hardness ntawm tooj yog 100 rau 150), keeb kwm hu qhov no Lub sijhawm ntawd yog Hnub nyoog Bronze.