Yog lub tooj dag li daj li ua tau

Lub daj tooj dag tsis zoo dua.

Brass yog daj vim hais tias tin tau ntxiv kom nws hardness, thaum ntshiab tooj liab yog reddish xim. Qhov ntau daj ntawm tooj dag, qhov ntau tin nws muaj thiab qhov tsis huv nws yog.

Taw qhia rau tooj dag

Brass yog ib qho alloy uas muaj tooj liab thiab zinc. Brass uas muaj tooj liab thiab zinc hu ua tooj dag zoo tib yam. Yog hais tias nws yog tsim los ntawm ntau tshaj ob hom, nws yog hu ua tooj dag tshwj xeeb. Brass muaj zog hnav tsis kam, tooj dag feem ntau siv rau hauv kev tsim cov li qub, cov kav dej, cua txias sab hauv thiab sab nraud ntawm lub tshuab txuas cov yeeb nkab thiab lub tshuab hluav taws xob.

Txog tam sim no, cov khoom siv tooj liab ntxov tshaj plaws nyob hauv lub ntiaj teb no feem ntau yog nyob rau sab hnub poob Asia, xws li Iraq thaj tsam Zawei Chumi, pom tooj liab ornaments, muaj hnub nyoog txog 10,000 BC txog 9,000 BC; Copper ornaments yos los ntawm 9000-7000 BC kuj tau pom nyob rau hauv thaj av Ali Kashi ntawm sab hnub poob Iran.

Cov koob tooj liab thiab cov cones tau pom nyob rau ntawm Chayouni qhov chaw nyob rau yav qab teb Qaib ntxhw, yos txog 8000 BC. Cov khoom siv tooj liab no yog cov khoom sib tw ntawm ntuj liab tooj liab, tsis yog tooj liab tau los ntawm smelting ore.

Yog tias koj muaj lus nug, thov hu rau peb. Peb lub tuam txhab tuaj yeem tsim ntau yam koob txhaj tshuaj, koob tshuaj kho mob, koob txhaj tshuaj, koob tshuaj hypodermic, koob txhaj tshuaj, koob tshuaj tiv thaiv kab mob, koob txhaj tshuaj, koob txhaj tshuaj, koob txhaj tshuaj, koob xaum koob, koob ovum khaws koob, koob txhaj tshuaj, thiab lwm yam Yog tias koj xav tau kev kho koob cov khoom, thov hu rau peb. Peb tos ntsoov rau koj qhov kev nug! Qhov zoo ntawm cov khoom tsim nyob rau hauv peb lub Hoobkas yuav txaus siab rau koj!

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