Disclosed are a multi-carrier supporting method and apparatus. In one embodiment of the invention, a source node selection request is sent to the source node group. The computer receives the reflected spectral data and calculates an endpoint signal by comparing the reflected spectral data with previously collected reference data. At least one first nozzle may be positioned substantially above the conveyor and configured to deliver the fluid onto the product as the product is pushed by the plurality of panels. A compressed surface structure is formed in the surface areas supporting the cover layer before applying the cover layer, and the cover layer is bonded in substance to the compressed surface structure. The fluorescent color calibrator includes a plurality of fluorogenic compounds adapted to fluoresce in a visible color spectrum; and a second plurality of fluorogenic compounds adapted to fluoresce in multiple visible gray spectrums.