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.
Remove the metal from the vinegar, if it looks rusty enough for your liking; if not, leave the pieces in for another day. Remove the pieces with rubber gloves or tongs if you do not want to touch the vinegar. Rinse the pieces off with a garden hose or wipe them off with a damp rag.