Sulphur sticks - svavelpinnar
The sulfur stick is lit and smolders, something like the taper that is used to light fireworks. The color of the sulfur smoke is used to find the leak. When there is no ammonia the smoke is colorless but when ammonia is present the combined sulfur and ammonia vapors produce a white smoke.
Sulfur sticks have been used to find ammonia leaks for at least 100 years.
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