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.
1 Pour two cups of vinegar into the spray bottle. 2  Add two cups of water on top of it. 3  Put the lid on the bottle and shake it vigorously to mix the water and vinegar together.  Fold the aluminum foil until you have a small square of approximately two inches across in each direction.