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Try using formaldehyde or ammonia in the open (no fume hood or fume extraction system), you will see why you need a fume hood. Formaldehyde is extremely toxic.
I used to use formaldehyde for bug dissection in outdoor and I had no problem. For alternative photography I'm using iodide with no problem and if I'm in indoor I'm using gas mask. Anyway, thanks for the help. I want to get less official answer...