I still think this is part of the "bad press" hydrogen got because of the Hindenburg.
Has anyone seen a documentary where a JPL engineer first put forward the theory about the Hindenburg's "skin" as a possible source of it's demise?
Canvas, doped, with iron oxide on the inside and aluminium on the outside, can anybody spell "thermite"?
People were allowed to smoke on the Hindenburg, they just were not allowed to use a naked flame to light up with.