DIY fridge magnets
How to make fridge magnets at home
Looking for a new way to stick your important notes and photos to the fridge? Here’s a simple way to make your own amazing magnets!
Dye can leave marks on surfaces.
Reagents and equipment
- 100mL water;
- food coloring;
- 150g gypsum (alabaster);
- silicone molds;
Pour the water into the container and add some food coloring. Add the gypsum in small portions. Mix thoroughly to remove any lumps. Pour into the silicone molds. Wait a few minutes. When the gypsum starts congealing, insert magnets into the base. Wait for it to harden completely (approximately 5 minutes), and your fridge magnets are ready!
The drying time depends on the amount of water in the mixture – the more water, the longer it will harden.
Gypsum’s chemical name is calcium dihydrate sulfate CaSO₄·2H₂O. It occurs naturally in mineral form – selenite CaSO₄·2H₂O and anhydrite CaSO₄. When heated to 150-180 ° C, calcium dihydrate becomes semi-aqueous calcium sulfate CaSO₄·0,5H₂O, better known as gypsum plaster. The difference between the compounds is the number of water molecules they contain and also the mineral structure. When mixed with water, gypsum powder quickly hardens, reverting to calcium sulfate dihydrate. This property of gypsum makes it useful in construction, sculpture, and medicine.