All plastics are oxygen permeable to some degree. Glass is highly resistant, provided the caps are efficient and there is not already air inside. Amber is for sake of blocking UV. And you can get a shatter resistant variety with a soft plastic overcoat. There are a lot of wineries in this area, along with do-it-yourself wine and beermaking shops, which sell products to displace air with inert gas. Or you could just go out and rent a tank of argon. No need for me; I just decanter into smaller glass bottles. Food-grade stainless might not tolerate certain darkroom chemicals. So there's that. And accidental poisoning? - perhaps not as common as slow deliberate poisoning at your local FastFood restaurant. But you can buy big stick-on skull and crossbones labels. Darkrooms shouldn't be accessible to children anyway.