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Testing the LIFE module for leaks A black light is used to look for leaking test fluid following tests of the Phobos LIFE biomodule, September 16, 2008. . Engineer Bud Fraze holds the Delrin carrier and examines it and its Delrin sample tubes which were loaded with a test fluid much light yellow highlighter fluid which appears very bright under a black light. Bruce Betts/The Planetary Society