Visible crew/equipment: In the scene where Danny and Rusty are talking to Roman in the kitchen, the camera can be seen in the reflection of the kitchen window.
Visible crew/equipment: Crew members and stage lights get reflected on Bank's hard hat when Danny pays him a visit.
Answer: I don't think there's any way of providing an exact answer to this question, but I think it's safe to say that whatever materials they used were highly bacterial but not lethal (otherwise the 5 Diamond Award critic would be dead or in serious condition).
filledemot