-White light-reflecting sealing films for use with white microplates BrightMaxTM sealing films are 203 µm thick white vinyl films with 37 µm acrylic adhesive for use with white microplates. The sealing films may be applied to either the top or bottom of the plate. A split backing aids in applying the sealing film properly. The light-reflective properties of BrightMax plate-sealing films on clear-bottom plates maximize sensitivity of bioluminescence and chemiluminscence assays in bottom-reading luminometers. White films also have application as a backing matrix for microscopy of punchout samples from filter plates, for example in ELISPOT assays. Dimensions are 76.2 by 116.0 mm with no end tabs. A backing split singly on the long dimension aids in applying film to plates. Recommended temperature range: -40 °C to +80 °C. maximize intensity and signal-to-noise ratios in luminescence assays additional applications for mounting and storage of filters for microscopy, for example in ELISPOT assays