Back in college, I was a chemistry major and looking for a job. My chemistry teacher caught wind of a local company doing exactly what you describe here only on an industrial level. Sadly, that company was not using safety measures at all and was using cyanide solutions as part of their process. I witnessed open buckets of solution bubbling from heat with cyanide vapors coming off them! Needless to say I high-tailed it out of there and never looked back.