Insert water first and then potassium permanganate crystals into the tube through the upper opening. If you heat up the lower part, the salt depositated at the bottom moves upward, colouring all the water. The burner is sold separately.
- 1 x Glass convection tube
- 1 x Metal rod with base
- 1 x Bottle of potassium permanganate crystals
- 1 x Pliers