De La Rue International Limited

Portals (bathford) Limited

Richard Bryan Jotcham

Gerald Sidney Payne

David Edwards

Security elements

The invention relates to improvements in security features in paper and other substrates and in particular to an activatable feature to warn of tampering. The invention further relates to a security feature for a security document comprising at least one activatable layer and at least one visually apparent masking layer, said at least one activatable layer comprising a composition which is generally non-mobile but which becomes mobile when wetted with a liquid, said composition further including at least one detectable component, in which under dry conditions said at least one masking layer wholly covers the activatable layer and renders it non-detectable.

Security features

A security packaging incorporates security features as an integral part thereof. A blank made from a substantially rigid material incorporates at least one repeatedly verifiable authenticating security feature which cannot be separated from the material without causing damage to it. The security feature may comprise a multilayer laminate.

Security packaging

A security thread (11) for use in security articles (10), includes a substrate having a coating on one or both sides thereof, the coating containing a thermochromic material selected from pigments and dyestuffs which changes from coloured to colourless when the temperature of the pigment or dyestuff is changed to the activation temperature. The thermochromic material may be coloured when the temperature is below the activation temperature and become colourless when the material is at the activation temperature or above. The thread (11) is for security paper (10) for use in producing banknotes and the like.

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Trowbridge, United Kingdom

Richard Bryan Jotcham