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.
Try vinegar! Soak the brush in vinegar for an hour or so until you can bend the bristles. Fill a saucepan with vinegar until the brush bristles are covered. Bring the vinegar to a boil and let it simmer for a couple of minutes. Remove the pan from the heat and let it cool for a minute before removing the brush. Gently comb the brush with your fingers.