Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to melt aluminum [title] Position your foundry. [step] Set your foundry in a metal stand or on an insulated surface (like gravel, sand, or bare earth; concrete could crack from spills). Make sure that the surface can withstand the more than 1220 degrees fahrenheit (660 degrees celsius) needed to melt the aluminum.

Ending1: Do not heat it in the oven; you want it cool enough for cooking. [substeps] Hot iron will typically react badly with your forging iron to melt it (the proper temperature). Ending2: [title] Take your foundry case or container off the surface. [step] Wrap your thermometer into each to prevent it from setting off on fire. Ending3: [substeps] Make sure the surface is cool enough and moist. Otherwise the texture of your prototype will be discolored, brittle, and unappealing. Ending4: Avoid any wooden or plastic surfaces because they will melt or burn. For the best results, set your foundry in a sturdy metal stand that will not easily tip over.

Answer format: ending1/ending2/ending3/ending4