COLIN CUTHBERT / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / SCIENCE PHOTO LIBRARY
Warning signs. The signs warn about flammable gas (red) and non-flammable compressed gas (green). Flammable gases can ignite easily and cause fires and explosions. Compressed gases, even when not flammable, can explode if the gas container is damaged.
Model release not required. Property release not required.