The Gas That Knows

Item #: SCP-4303

*Object Class:** Safe

Special Containment Procedures: SCP-4303 is to be kept in a standard low-security warehouse building at Site-66. The warehouse in which the cylinders of SCP-4303 are stored should be air-tight, with humidity levels never exceeding 30%.

All cylinders containing SCP-4303 should be checked for signs of damage bi-weekly. Only staff equipped with proper respiratory equipment are to be approved to check for damage. The cylinders containing SCP-4303 are never to be opened, modified, or removed from their designated storage area, unless approved for testing.

Due to the relative predictability of SCP-4303, no additional security measures or surveillance are needed.

Description: SCP-4303 is a cloudy white gas of unknown composition. SCP-4303 is stored inside of what appears to be 79 average-looking hydrogen storage cylinders. The cylinders in which it is stored measure 55 inches in height, by 9 inches in diameter. The 79 cylinders of SCP-4303 were voluntarily handed over to the SCP foundation on January 12, 1998 by a Russian scientist named [DATA EXPUNGED]. The scientist was found to be cooperative, yet is unaware himself of how SCP-4303 obtained it's anomalous properties. (See: Interview 4303-1)

There are believed to be at least [DATA EXPUNGED] existing cylinders containing SCP-4303. If any additional cylinders are found, immediately contact Dr. Mantel and begin protocol [REDACTED] as soon as possible.

SCP-4303 displays no anomalous physical properties. SCP-4303 is an otherwise normally behaving gas. It is believed to be slightly lighter than air, due to it's tendency to slowly rise upwards. The gas is semi-transparent, with a milky white color.

SCP-4303's anomalous properties will only be observed once it has been inhaled by a human being.