Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to assay gold [title] Prepare your equipment. [step] You will need a crucible to put the sample into. You will need a heat source such as a torch or furnace to bring the sample to high temperatures.

Ending1: You will also need other reactants such as the additives to create the flux, the bone ash to cupel the metal, and some sodium nitrate to extract residual silver. You will also need molds to pour hot metal into. Ending2: [title] Close up the crucible for a minute or two and let it harden. [step] Make sure to turn it off before leaving it. Ending3: To get your equipment : [substeps] Flashlight a siphon for boiling water a sturdy metal pan. Hessian pans are necessary if you are welding gold with a sheet of metal. Ending4: If you want to make it as invisible as possible, build a " cardboard box " that blocks out the flame at least 50 inches (100 cm). Thin cardboard will work but there are specialty materials that you should buy.

Answer format: ending1/ending2/ending3/ending4