If you find a refrigerant leak while using a halide torch, what will happen to the flame as the exploring tube approaches the leak?

Correct Answer: Option D — it will change from blue to green

Halide leak detectors draw air samples across a heated copper element. In the presence of halogenated refrigerants like CFCs and HFCs, the flame reacts chemically with the refrigerant gas, causing the normal blue combustion flame to transition distinctly to bright green.