Technician Flanders

Item #: SCP-[NUMBER] "Smoking Coin"

Object Class: Safe

Special Containment Procedures:
Instances of SCP-[NUMBER] are to be kept individually in a sealed airtight transparent 10cm x 10cm x 20cm container composed of reinforced glass. A vacuum within the container is to be maintained by a specialized vacuum-pump outfitted with ABECO-P3-class chemical filters. These containers are to be placed in a 12m x 12m x 6m chamber of reinforced concrete, which is to be fitted with a BEK-Hg-class chemical filter and ventilation system. The container, pump, and filters are to be replaced every six months or when significant levels of corrosion are detected on the container walls. When in transit, instances of SCP-[NUMBER] must be contained in steel-composite gas cylinders under armed guard. Personnel must wear CBRN-suits at all times when handling instances of SCP-[NUMBER]. Upon discovery, any new instances of SCP-[NUMBER] are to be secured as soon as possible and a CBRN-equipped Foundation decontamination team is to be dispatched to the affected area for cleanup.

Description: SCP-[NUMBER] is what appear to be a series of late-19th century coins, primarily originating from Western-Europe, with most instances being comprised of pure .999 silver. Instances of SCP-[NUMBER] have been observed to fluctuate between two distinct states, a dormant state and an active state. During the dormant state, instances of SCP-[NUMBER] typically exhibit no anomalous properties. At irregular intervals, individual instances of SCP-[NUMBER] will enter their active state and begin to emit various noxious gasses, most typically hydrogen-sulfide, hydrogen-cyanide, and phosgene.

In rare instances, more volatile gases have been emitted, such as event-████-██-██-B, during which ████ and ████ were emitted, followed shortly by █kg of chlorine-trifluoride, resulting in a containment breach and the deaths of █ members of the research staff assigned to SCP-[NUMBER]. Despite this, the coins do not appear to have suffered any damage or degradation from the incident.
Note: "We may need to revise containment procedures. If SCP-[NUMBER] is capable of producing, ████ and ClF3, there is a very real risk of it producing other dangerously unstable explosive compounds." - Dr. ████████

The length of SCP-[NUMBER]'s dormant state appear to depend on its proximity to the nearest instance of SCP-[NUMBER] of a different currency, with the interval decreasing linearly the further they are moved away from each other. Beyond a distance of ████ meters, instances of SCP-[NUMBER] are observed to enter permanently into their active state until brought back within the ████m limit.

Preliminary research suggests that the composition of emitted gas is dependant on what currency and which specific coins are involved. Each currency appears to have a "preference" in terms of what gasses are emitted. This "preference" appears to change when coins of different currencies are brought into close proximity with one another (See Addendum #3).

Update #1: It appears that the interval between SCP-[NUMBER] entering its active state is also be affected by proximity to otherwise non-anomalous individuals (See Field Report [Number]-012-1B) henceforth classified as SCP-[NUMBER]-A. As an instance of SCP-[NUMBER]-A approaches SCP-[NUMBER], the dormant-state interval reduces linearly, inversely proportional to the effect of removing one instance of SCP-[NUMBER] from another, with the SCP-[NUMBER]-A individual having no effect on instances of SCP-[NUMBER] further away than ████m.

Update #2: Following standard background investigation and genealogical research regarding [Redacted] or related organizations, all instances of SCP-[NUMBER]-A were determined to be direct descendants of [Redacted], and other individuals directly associated with [Redacted].
Note: "As long as such individuals are kept at least ████m away from foundation sites containing SCP-[NUMBER], they should have no affect on SCP-[NUMBER]'s state fluctuation. I don't think we really need to worry about this too much." - Dr. ██████

Update #3: Following the proposal of Dr. █████, SCP-[NUMBER]'s previously believed to be random fluctuation pattern has been shown to be the result of movement patterns of SCP-[NUMBER]-A instances near ████████████, ██████.

Addendum #1: Initial Discovery and Retrieval:
SCP-[NUMBER] was initially discovered by Agent while investigating the suspicious deaths of several patrons of ███████ coin auction house in ███████ near Lyons, France. MTF Beta-7 was called in and the item was secured without incident. A cover story was fed to local media that a nearby World War II-era chemical munitions dump had leaked into the soil surrounding the auction house.

Addendum #2: Known Instances:
Known instances of SCP-[NUMBER] include 6 Francs (Belgian, French, and Luxembourgish), 12 Marks, 3 Krones, 2 Lire, 18 Pounds, 22 Dollars, 5 Rubles, 1 Baht, 4 Pesetas, and 29 Escudos. All instances of SCP-[NUMBER] are of a denomination of 1 unit of the base currency.
Note: All known instances of SCP-[NUMBER] were discovered in pairs of two or more. Any deviation from this pattern should be reported immediately.

Addendum #3: Threat Rating Emission Tests:

Incident Report [Number]-201: