Different oxides have different colors.
Iron III oxide is reddish orange, aluminum oxide is colorless.
Those are just a couple examples
Ferrous oxide, also known as iron(II) oxide, is typically black in color.
Sodium oxide is typically white or yellow in color.
Ferrous oxide is typically a black or dark brown color.
In the United States, the color code for a nitrous oxide cylinder is sky blue. However, it is important to always refer to the specific guidelines provided by the cylinder manufacturer or supplier to confirm the color code.
Zinc White
Ferrous oxide, also known as iron(II) oxide, is typically black in color.
it is variable
Cupric oxide is typically black in color.
Iron oxide is typically a reddish-brown color.
Sodium oxide is typically white or yellow in color.
the colour of mercuric oxide is an orange powder.
The flame color of calcium oxide is typically a brick-red or orange-red color.
White
Green and Black
White
NO-gas is colourless
Gold oxide is typically red or reddish-brown in color.