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i think it's ag46 as well. will check what's left from the last A/C job.
The oil already had dye in it.
The dyes are UV fluorescent dyes so you basically use a UV light and some yellow glasses.
so I'm not sure what you're trying to do.
You can buy dye and inject into the system or when you're replacing a component and needing to add oil, I think you can buy oil with dye in it already like I did.
i think you're referring to the sniffer test.
like so
https://www.harborfreight.com/electronic-freon-and-halogen-leak-detector-92514.html