A large amount of glazing configurations means the optimum construction for performance and visual appearance can be yours. For whatever make-up of glazing you have in need for your project, you can obtain published L*, a*, and b* color values from the International Glazing Database (IGDB) maintained by the Lawrence Berkeley National Laboratory (LBNL). These values are the starting points for final color targets which you obtain from your unique process. Custom color target values can then be entered, which, along with color tolerance values, allow you to determine whether your heat-treated monolithic, laminate, and IGU color readings fall within allowable three-dimensional color space from your target using the CIE 76 calculation method (ΔE*ab values). You can stay with the default ASTM C1376 Standard color tolerance of 4.0 ΔE*ab, or enter your own if you want to maintain a tighter internal color tolerance. Two dimensional plots are also generated for each of the three color dimension combinations to give you a visual indication of how tightly the color data is grouped. These also give you an idea whether color variation and out of spec points are due to L* (lightness), a* (red versus green) or b* (yellow versus blue) differences. Using a handheld spectrophotometer, you can gather reflected color data from the #1 (non-coated side) glass surface, which can be manually entered or uploaded into this tool for evaluation. You can maintain your data, organized by project and product configuration, and print customized reports with your company logo included. For more information on tool features, click