“Homemade luminophore” experiment
How to make a glowing powder at home
It is widely believed that glowing powders and mixtures are attributes of magicians and wizards. But today we will debunk another myth and tell you how to make magic sand.
Wear protective gloves, a mass and glasses, and work in a well-ventilated room. Observe safety rules when working with flame and very hot objects.
Warning! Only under adults supervision.
Reagents and equipment:
- boric acid (5 g);
- fluorescein (0.005 g);
- water (1 ml);
- wooden rod;
- aluminum mold from a tea light candle;
- heating device;
- mortar and pestle;
- Petri dish;
Put boric acid and fluorescein in the mold, add water and stir thoroughly. Then heat the resulting mixture. Heating must be carried out carefully, with regular stirring. As the mixture heats, water will gradually evaporate, and it will melt and turn to a glass-like mass. After cooling, move the mixture to a mortar and crush thoroughly. Move the resulting powder to a Petri dish, turn off the light and shine the torch on it. Watch it glow in the dark.
On heating, boric acid partially loses water, turning into a mixture of boric acids and boric oxide:
H3BO₃ = H₂O + HBO₂
4HBO₂ = H₂O + H₂B4O₇
H₂B₄O₇ = H₂O + 2B₂O₃
With further heating, the mixture melts, turning into a glass-like mass, which is called luminophore. Luminophore is a substance capable of transforming absorbed energy into light radiation. The fluorescein in luminophore plays the role of an activator, and fits into the crystal lattice of products of the dehydration of boric acid, causing the boric luminophore to glow after it is irradiated with light.
The luminophore should be kept in a sealed container.