Blue detectable plasters, catering plasters, are widely used in areas of food preparation from sandwich shops to butchers to cake manufacturers to large scale mass produced food lines. The plasters are directly detected because of their blue colour (there are no natural food products that are blue) but also because of an aluminium foil under the woundpad which can be detected by metal detectors. The Detectaplast® Premium waterproof & elastic plasters are made from very strong waterproof PU (poly-urethane) material which lets the wound breath. The hypoallergenic glue sticks very well in difficult circomstances. The absorbent woundpad does not stick to the wound.