Making delicious rock candy at home is fun and a good science experiment to understand saturated solution and super saturated solution. You will love to see how crystals grow on wooden stick as time passes. You can taste and eat the crystal that you will make.
- 3-4 Cups of sugar
- Clothespin (Larger than mouth of the glass)
- Wooden Skewer OR Popsicle stick
- Wet the Wooden Skewer in water than roll it on the sugar so that granules of sugar stick on the surface of it.
- Place the Skewer aside and let it dry completely so that granules of sugar firmly stick to it. If sugar is not firmly stuck to Skewer, it will fall in the glass and crystallization will take place in bottom of the glass so be careful.
- Boil 2 cups of water into a pan
- Add half cup of sugar into the boiling water while stirring and completely dissolve it. Keep adding sugar in the pan until it completely stops to dissolve further.
Note: Each time you add sugar in the pan it will take to time dissolve it so be patient and keep stirring.
- Pour the hot sugar solution in the glass up to the top level.
- Clip the dry end of Wooden Skewer into the clothespin nearer to the spring. Now gently place the Wooden Skewer in the hot sugar solution by placing clothespin at the mouth of the glass.
- Put a piece of paper on top of the glass and place it on a safe place and let it cool.
The sugar crystals starts to grow and it will take 3-7 days to complete the process.
When sugar is dissolved in water at room temperature a point will come where sugar will not dissolve further, it is called saturation point and solution is called saturated solution. When you heat that solution at boiling point more sugar will dissolve in it and again a point will reach where sugar will not dissolve further, than it is called super saturated solution.
You made this solution and placed it to cool. When this solution becomes cool, it becomes very unstable and sugar starts to form crystals in solution. The sugar granules that were stuck on the Wooden Skewer are served as seed crystals on which dissolved sugar will cling to form crystals.
- Try to add food coloring in the solution for colored rock candy
- If you want to make several candies of different colors. Use different glass for each color. You can make sugar and water solution in one container and mixing the color separately in each glass.