Mouse systems M4 Optical Mouse

Actually, it has lines of one colour running vertically and lines of another colour running horizontally, against a shiny background. To my eye, the vertical lines look blue and the horizontal lines grey; I suspect there is a reflectance characteristic my eye is not capable of picking up there, especially as one of the LEDs in the mouse is giving off invisible light (again, to my eye). The visibly-lit LED looks red to me, and (based on covering each LED in turn and seeing which dimension's motion breaks) goes with the blue lines (not surprisingly); the invisible-light LED goes with the grey-appearing lines. If you can find suitable inks, printing vertical and horizontal lines on a shiny surface should do fine - but beware that such mouse pads exist in at least two and I think three different resolutions; while a mouse designed for a fine-resolution pad works fine with a coarser pad, the converse is not true. If you want I can approximate the line spacing of the mouse pads I have, with a ruler or tape measure and some careful counting. /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse at rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B