The secret of amethyst: Color that changes with heat HEAT-TECH info 1 month ago This is a video of heating amethyst with a halogen point heater to change its color. Please check the following site for more information. Related page: Heating, melting and vitrification of rocks series 30 – Amethyst Heat dissolution of black lava No.53 Heat test of the color filter Shrinkage of heat shrink tube with heat resistance of 200℃ Heating of emerald (Nanosital) Proven by heating paper : Emissivity difference by color Heat dissolution of nylon yarn Heat dissolution of acrylic beads