It looks like we've found someone to deal with it but I wondered about doing something similar. Though a cursory glance suggests that if it's thallium sulphate, it's reactive to heat.
I never cease to be amazed that human beings didn't extinct ourselves long ago!
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u/kat_fud 15d ago
You might want to take a small sample to have it tested, although I'm not sure where you'd take it.
I wonder if you could pour wax over it and just lift it out.