Chemical laser.
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Previously:
https://www.homemadetools.net/forum/...2374#post96156
https://www.homemadetools.net/forum/...231#post150051
https://www.homemadetools.net/forum/...188#post121171
https://www.homemadetools.net/forum/...118#post160939
https://www.homemadetools.net/forum/...429#post173591
