The blank of the first vertical line should be that the aluminum sheet has obvious scratches and the iron sheet does not.
The second vertical line should be to hold the aluminum sheet with pliers or tweezers and put it in an open flame. (white material should be alumina. )
The third vertical line should be that aluminum will react with acetic acid to produce gas (as for what gas I have forgotten for too many years, the landlord can check the chemical formula of the reaction between aluminum and acetic acid, which should be hydrogen)