With a sniffer, you can recover down to atmosphere or less, recharge with nitrogen or argon, and the small fraction of refrigerant can Still be easily detected. Propane will not reach a high psig reading at room temp, it starts to condense. Same with R22.
The flame test will work, though. If you use BBQ gas, you can also smell it when it leaks out, as long as you leave the compressor shut off. If it circulates much, the filter dryer will catch the stink oil, and it will lose its smell. I still like the soap bubble solutions myself. Spray or glop on some Scooby doo juice and watch for foam. Patience helps a lot.
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