Patent ID: 7878410

Claim:
A label ( 1 ) comprising, a colouring substance producing a print ( 3 ) by the effect of heat, the colour of which print ( 3 ) contrasts with base colour of the label ( 1 ), and an agent ( 7 ) capable of, at least partially, destroying contrast between said respective colours of said print ( 3 ) and label ( 1 ), if the label ( 1 ) is exposed to a temperature above a predetermined maximum value, the label ( 1 ) having a surface field for said print ( 3 ) containing coded information, a porous, capillary-suctioning substrate ( 5 ), and said agent is ( 7 ) which is included in a loading of a substance ( 7 ), which is solid at temperatures up to said maximum value, but becomes liquid above the same, and which loading of is located beside the surface field of the print ( 3 ), wherein both the print ( 3 ) and agent ( 7 ) are located on top of the porous, capillary-suctioning substrate ( 5 ) adjacent one another.