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They are good for cleaning surfaces like furniture, walls and floors

In smoking environments, these trace metals are found in indoor air and also on surfaces and in dust particles, and people can be exposed to them through pathways such as dermal uptake and ingestion, said Xiaochen Tang, a researcher in the Energy Analysis and Environmental Impacts Division of Berkeley Labs Energy Technologies Area, and first author of the study

This is only an estimate, however

This technique involves fine inlays of gold and silver on iron surfaces, creating detailed decorative scenes inspired by Japanese landscapes, mythology, and traditional motifs