Fade-Out® refers to our printing process on Clearprint Vellum. Grid sizes are measured by number of boxes per inch with the exception of isometric and mm grid layouts.  All Fade-Out grids are printed in non-repro blue, which will not reproduce when used with traditional graphic arts cameras.  For scanners, this grid pattern will be picked up, however, by editing an image in grayscale, adjusting the brightness and contrast will eliminate these grids.  These grids may also be eliminated in computer editing software, like Adobe Photoshop, by removing images from the blue channel in RGB mode.