We still do not agree on the events that led to the making of bronze metallurgy. Our best guess is in the later Neolithic/Early Bronze Age the first relic found in Western Asia in the third millennium BC. The method was quickly spread outward from there. It seems directly linked to the practice of living in one place for a long time. Where increased farming and other activities in the same time. The advantage of bronze which is a blend of elements 90% copper and 10% tin is has a lower melting point. Bronze will stay in a liquid longer when filling the mold.
While there are several sources for copper, tin on the other hand is found primarily in southwest Turkey, Afghanistan and Cornwall. Creating a worldwide trading throughout the area.
Incense burners have been in use since ancient times and in many cultures. Incense burners have been used in both secular and religious contexts. They range from simple earthenware bowls to pots to intricately carved silver or gold vessels. They can be just small simple table top a few inches high or can be several feet tall and with very ornate details. Many designs use openwork to allow a flow of air. In many cultures, burning incense has spiritual and religious connotations, and this influences the design and decoration of the censer. They use a combination of aromatic ingredients and are used to freshen the air.