Pay content for time limit to check for freenAnswer Football 999, 505 yuan/gram. Although gold itself is not corroded, its chemical affinity with sulfide is very strong, and it is easy to absorb hydrogen sulfide gases in the air. The surface shows dark colors such as orange, brown -red and other colors. The completion of the production of gold products requires many complex processes.
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Pay content for time limit to check for freenAnswer Football 999, 505 yuan/gram. Although gold itself is not corroded, its chemical affinity with sulfide is very strong, and it is easy to absorb hydrogen sulfide gases in the air. The surface shows dark colors such as orange, brown -red and other colors. The completion of the production of gold products requires many complex processes.