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blacken [blackened, blackening, blackens]▼(make dirty)
verb
[UK: ˈblækən] [US: ˈblækən]

contaminate [contaminated, contaminating, contaminates]▼(To introduce impurities or foreign matter)
verb
[UK: kən.ˈtæ.mɪ.neɪt] [US: kən.ˈtæ.mə.ˌnet]

pollute [polluted, polluting, pollutes]▼(to make something harmful)
verb
[UK: pə.ˈluːt] [US: pə.ˈluːt]