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mercury oxide
red
iron (II) oxide
black
copper (II) oxide
black
sodium oxide
white
aluminium oxide
white
zinc oxide
yellow when hot, white after cooling
lead (II) oxide
orange when hot, yellow after cooling
calcium oxide
white
magnesium oxide
white
sodium oxide
white
potassium oxide
white
iron (III) oxide
reddish brown
iron (II, III) oxide
black
magnesium hydroxide
white
aluminium hydroxide
white
calcium hydroxide
white
zinc hydroxide
white
iron (II) hydroxide
dirty green
iron (III) hydroxide
reddish brown
lead (II) hydroxide
white
copper (II) hydroxide
pale blue
silver oxide
brown