Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to make a homemade thermometer [title] Make your measuring solution. [step] Fill a measuring cup halfway with water and halfway with rubbing alcohol. Drop four to eight drops of liquid food coloring into the solution and mix gently to combine.

Ending1: Dip a cotton ball dipped in the dye into the mixture. Then dip a second cotton ball in your injected dye and place it on your prepared thermometer. Ending2: Discard the excess rubbing alcohol, leaving behind a thin layer of food coloring. [substeps] Divide the amount of liquid using a spoon to get a variety of colors possible. Ending3: [substeps] Note that the food coloring does not alter the way that the solution reacts to temperature changes. Its only purpose is to make it easier for you to read the level of the water in the straw when you use your thermometer. Ending4: [substeps] Do not use paraffin food coloring. This coloring may dry out sensitive skin and cause clogged pores.

Answer format: ending1/ending2/ending3/ending4