Great white sharks. Trophic Pyramid Information that is in video: An ecological pyramid (also trophic pyramid, energy pyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or biomass productivity at each trophic level in a given ecosystem.
The risk is that you may not be able to remove all the acid and if it is left on the metal it will continue to corrode the metal. So to give you a quick answer, you can use vinegar to etch the aluminum, but you have to rinse the surface thoroughly to remove all the acid residue.
Aluminum is dangerous to the human body...even in small amounts. 1  Those aluminum coke and pepsi and beer cans leech aluminum into your drinks. Your aluminum cooking pots leech aluminum into your food and so does aluminum foil that you wrap your food in. Processed cheese, cake mixes, vaccines, baby powder, lipstick, deodorants, nasal sprays, antacids all contain aluminum.