Is there a difference between oil injection and hand oxidation?

Please answer clearly first: both of them are for coloring the surface of the hand board, and there are differences between the two processes.

Explain the reason:

Oil spraying is mainly to spray a layer of paint on the surface of the hand board.

Oxidation is to soak aluminum alloy hand plate in liquid medicine to make it undergo oxidation reaction.

Is there any solution: If you don't know anything, you can look for Wei Tuo model to find out.