Per 
SCP-6221
Object class: safe
Special Containment Protocol:The object must be stored in an room 7 meters wide, 7 meters long, and 10 meters in height. it must be enclosed in a wooden box that is approximately, 2x2x2 meters.
Description:The object when in contact with any personnel, will corrode the personnel it is in contact with. If held in contact, without proper protection, it can cause irreversible skin and bone damage. If any personnel must come in contact with it, they will be required to wear a glove made of inorganic material. If the object does come in contact with skin, immediately rinse with any fluid, if action is not taken immediately, the person will experience hallucinations and a burning sensation on the affected limb.
WARNING: THIS OBJECT IS TO BE LOCKED UNDER SECURITY ACCESS LEVEL 3