Hi. It worked fine for me. Which part isn't working? (I haven't preprocessed anything with BFF)

same

Perhaps a fluid with microscopic metal particles suspended in it, and manipulated several times per second by an electro-magnetic field

@@leeskinner9627 What you describe is basically sounds like e-ink. Though you may be more interested in a similar but significantly different idea that is "Interferometric modulator displays", where each pixel is a "microelectromechanical system" (MEMS). While eink only does basic absorbsion/reflection of light, with IMODs the wavelength of light is *changed* based on how "deep or shallow" the reflecting element is. Similar to how the structures found on many insects don't actually reflect their own color, but change the incoming light into something else. This results in those brilliant metallic displays you see on butterflies and moths. There was research done on making a full display, being branded "Mirasol" and worked on by Iridigm and later Qualcomm, with plans to produce an e-reader screen that not only could work in full sun like e-ink, but had color and a refresh rate fast enough for relatively smooth video, while still being able to maintain an image without further power. Unfortunately the efforts to produce these screens eventually fell through and the technology became vaporware after limited releases of a few products in asian markets. I believe that it was likely due to extremely high defect rates that they couldn't seem to overcome.