Per 
Special Containment Procedures: SCP-5962 is to be contained in a glass box equipped with a barrel bolt lock. It is to be placed in a 10m x 10m x 10m room. The room has to be equipped with 5 lamps, 4 around the box, and 1 above the box. Outside of the room, there should be jars of strawberry jam, peanut butter and honey. In case of a containment breach, if the light it reflects is red, it is recommended to spill strawberry jam at it, if the light it reflects is brown, it is recommended to use peanut butter, and if the light it reflects is yellow, is recommended to use honey.
Description: SCP-5962 was found in a plastic water bottle in █████████ during a recovery mission of SCP-████. It was created around 198█. SCP-5962 is a creature similar to black slime. SCP-5962 can change its density on wish. It can also stick to any surface. The light SCP-5962 reflects is in the colour of its current "allergy".
SCP-5962 weighs around 1kg. It is capable of taking control of any creature if it enters its body through its mouth, ears or nose. When SCP-5962 is in control of a body, it is capable of talking. The victim's body slowly loses density and becomes more black in colour until it fully becomes SCP-5962-1.
Addendum: SCP-5962 mass is called SCP-5962-1. SCP-5962's victim is called SCP-5962-2.
Addendum: It is theorized that SCP-5962-2 can talk and that SCP-5962 has a membrane that changes colour based on its current allergy. The research on this is in pending.
Incident 5962-A: Security guard A██████████ and K█████████ escorted D-9001 to SCP-5962's cell for a test. The test included rotating SCP-5962's box to see how it will react. Most of the time SCP-5962 stuck to one wall and remained still.
0,3kg of SCP-5962-1 slipped through the hole in the cylinder lock it's box was previously equipped with.
Then SCP-5962 fell on D-9001's shoulder. It quickly jumped onto Guard K█████████'s shoulder. They met with Guard M███████ and he escorted D-9001 back to his cell. Then they went to the cafe for a break. Further information is in the interview log underneath.
Interviewed: Security guard A██████████ who has participated in incident SCP-5962-A.
Interviewer: Dr R███████
Foreword: Interview on Incident SCP-5962-A.
<Begin Log, [23:04]>
Dr R███████: Can you please tell me about this situation?
Security guard A██████████: …
Dr R███████: I noticed that you and Guard K█████████ were good friends.
Security guard A██████████: Yeah…
Dr R███████: What happened when you went to the cafe?
Security guard A██████████: Guard K█████████ suddenly became aggressive… he started to punch everyone at the table, when we all backed out he pulled out his firearm and pointed at me with it. He didn't shoot long enough for me to hide behind a table. Then he shot at the wall. He looked surprised. Then he shot a cup, when he saw the cup shattered, he was visibly satisfied.
Dr R███████: (Dr R███████ makes a note)
Security guard A██████████: Then he started to walk to us. Then, Guard M███████ walked into the room and as soon as he saw what was happening, he shot him in the chest. Then, this black thing got out of his body and went somewhere, we were all shocked so we didn't chase it.
Dr R███████: Thank you. I think that would be everything.
<End Log, 23:24>
Closing Statement: After the incident, SCP-5962 returned to its cell.
Dr R███████'s notes: Because of SCP-5962-2's reaction to a gunshot, we can tell that it hasn't possessed a human in some time, or this was its first possession.
