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.
The most common vinegars found in American kitchens are white distilled and apple cider, but the more adventurous may also use red wine vinegar; white wine vinegar; rice vinegar; or gourmet varieties, such as 25-year-old balsamic vinegar or rich black fig vinegar.