By Nicole Fotheringham | Updated Aug 30, 2022
Growing crystals is a classic hands‑on experiment that illustrates the principles of solution saturation, crystallization, and evaporation. While traditional methods can take weeks, you can accelerate the process without sacrificing safety or educational value. The following protocols use readily available household chemicals—salt, Epsom salt, and washing soda—to produce clear, well‑formed crystals in a matter of hours.
Fast‑Track Crystal Growth Techniques
1. Salt (Sodium Chloride) Crystals
- Fill a clean jar or glass about ¾ full with water.
- Heat the water to a rolling boil, then pour it into a smaller vessel until it is ½ full.
- Gradually stir in 1 Tbsp of table salt until no more dissolves (≈½ cup total).
- Thread a piece of string or a shoelace around a pencil, trim to length, and suspend it so it dangles above the solution but does not touch the bottom.
- Place the jar in a warm, dry area; the faster the evaporation, the quicker the crystals will nucleate.
2. Epsom Salt (Magnesium Sulfate) Crystals
- Pour ½ cup of Epsom salt into ½ cup of hot tap water (do not boil).
- Stir until the solution is saturated—some undissolved salt should remain at the bottom.
- Transfer the glass to the refrigerator. Within about 3 hours, fine crystals will have formed.
3. Washing Soda (Sodium Carbonate) Crystals
- In a saucepan, combine 2 cups of water with ½ cup of washing soda. Heat until the mixture just starts to simmer.
- Pour the solution into a clean glass container and cover it tightly with plastic wrap to inhibit evaporation.
- Allow the solution to cool for 4 hours. Sprinkle a small amount of washing soda onto a pipe‑cleaner to create a nucleation site.
- Suspend the pipe‑cleaner on a pencil (ensuring it doesn’t touch the bottom). In about 20 minutes, a dense crystal network will fill the container.
Materials Checklist
- Table salt (or Epsom salt, washing soda)
- Water (distilled or tap)
- Open‑mouth jar or glass
- Stove or kettle for heating
- Pencil or stick
- String, shoelace, or pipe cleaner
- Plastic wrap (for washing soda method)
- Refrigerator (for Epsom salt method)
Safety Note
Always supervise children when using hot water or heating equipment. Wear heat‑resistant gloves and keep the stove out of reach of young users.
