Abstract: Disclosed herein is a security apparatus comprising a blocking device having a formable bag and a marker layer including a transferable marker composition that can be transferred onto any object penetrating the marker layer and any other object or person coming into contact with the marker composition in the event of an attempt to remove the blocking device by puncturing the bag. The blocking device may block an access point such as a manhole to block unauthorized access. The formable bag may be made to conform to the shape of an access passage by inflation or deflation using valve.

Abstract: A security product is disclosed herein comprising a pouch containing a composition, the composition including a mixture of a liquid, a polymer, a light-emitting material and a plurality of marker materials. The pouch may form part of a blocking device blocking an access passage that gives access to a restricted area, such as a manhole, and the composition may be transferred onto an object or individual coming into contact with the composition if an attempt is made to break through the pouch.

Abstract: A security product is disclosed herein comprising a pouch containing a composition, the composition including a mixture of a liquid, a polymer, a light-emitting material and a plurality of marker materials. The pouch may form part of a blocking device blocking an access passage that gives access to a restricted area, such as a manhole, and the composition may be transferred onto an object or individual coming into contact with the composition if an attempt is made to break through the pouch.

Abstract: Disclosed herein is a security apparatus comprising a blocking device having a formable bag and a marker layer including a transferable marker composition that can be transferred onto any object penetrating the marker layer and any other object or person coming into contact with the marker composition in the event of an attempt to remove the blocking device by puncturing the bag. The blocking device may block an access point such as a manhole to block unauthorised access. The formable bag may be made to conform to the shape of an access passage by inflation or deflation using valve.