Dymax Ultra-Red fluorescing adhesive from Intertronics (Kidlington, Oxfordshire, U.K.) was designed to account for the fact that many plastics naturally fluoresce blue under UV light, minimizing the inspection advantages of blue-fluorescing adhesives in parts assembly. Red-fluorescing adhesives reportedly remain naturally clear until they are exposed to UV light, then they fluoresce bright red, providing a vivid contrast that permits accurate bond-line inspection. The red fluorescence does not absorb the same light energy wavelengths as those used to cure the adhesive, resulting in faster and deeper cures when compared with the same adhesives containing blue fluorescence. Further, the product has a unique energy peak that cannot be reproduced by any other fluorescing compound. This offers manufacturers the ability to assemble or mark their products and assures them that, in the event of a future challenge as to the authenticity of the product’s origins, the products can be positively identified.