This is a video of removal of permanent marker markings on quartz tubes with a halogen point heater.

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Heating of the refractory brick Heating of the tile No.4 Joint of thermoplastic resin tubes No.1 Cold air cooling of test tubes No.10 Removal of the surface tension of the pipe hole drilling Heat dissolution of black lava Heating, melting and vitrification of rocks series 28 – Snowflake obsidian Heating, melting and vitrification of rocks series 23 – Sandstones