Good call!
The Los Angeles Public School system, in the 1960s, was thoughtful enough to hire master metalsmiths for their vocational-oriented classroom curriculum.
Safety was paramount, and the zinc issue was not lost on the instructor.
Soldering, stick-welding, aluminum casting, etc., were all conducted under forced-air exhaust and well ventilated workshop environments.
Neighborhood workshop, father-mentor-supervisors, wouldn't let our ignorance get the best of us either.
