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.
Undiluted vinegar can be used to remove rust from metal surfaces. It reacts with the rust and helps dissolve it off from the metal. Soak the rusty metal objects in vinegar for about 24 hours, and then simply wipe away the surface rust using a rag. This method is very useful for removing rust from nails, nuts and bolts. If the object is too large, simply pour some vinegar on the rusted surface, and wipe with a rag after a few hours.