Stir salt into boiling hot water until no more salt will dissolve (crystals start to appear at the bottom of the container). Be sure the water is as close to boiling as possible. Hot tap water is not sufficient for making the solution. read more
To make salt crystals easily at home, start by heating 0.5 cups (120 mL) of water in a pan until it begins to boil. Then, pour in 0.25 to 0.5 cups (59 to 118 mL) of salt, stirring until the water is clear. read more