What we need: coarse salt, a pinch of copper sulfate and clean water without boiling. It is better to take filtered water, but not just from the tap.
Let's make a solution of table salt: pour water into a container and place it in a vessel with warm water (about 50°C - 60°C). Ideally, the water will not contain dissolved salts, that is, distilled, but in our case, you can use filtered tap water. Pour table salt into a jar and leave for 5-10 minutes, stirring before doing so. After some time, the jar of water will warm up and the salt will dissolve. It is important that the water temperature does not drop too much. Then add more salt and stir again. Repeat this operation until the salt stops dissolving and settles to the bottom of the jar. As a result, we will get a saturated salt solution.Pour the solution into a clean container, removing any undissolved salt from the bottom of the jar.
Pour approximately 50 ml of the resulting solution into a small container. and dissolve in this solution several crystals of copper sulfate, about half a teaspoon. Mix well.
Pour our prepared solution with vitriol into a jar until it turns green and place it in a cool place at about 14-16 degrees.
After the solution has cooled, you need to tie a salt crystal to a string. Place the other end on a stick and lower it into the solution to a depth of 10 - 15 mm. And again put it in a cool and dark place. After 2-3 days the crystal will grow. Then it will stop growing and the crystals will seem to climb up. After 5 days you will see the result. The crystal you see has been growing for about two weeks.
Other crystals:
