This 2012 advice has aged poorly, and as with all absolutes, fails to consider context, capabilities, and functional goals.<p>In the specific case of e-ink, where colour is usually nonexistent (there are some colour devices, these are the exception and have limited rendering), where greyscales are limited (16 shades on high-end devices, and often less), and total foreground/background contrast is limited (restricted more by the dark "white" than the light "black"), the advice to avoid saturated blacks is quite poor.<p>This is most applicable to text, where the most frustrating experience is reading a greyed-out or coloured text, often on a shaded background. Firefox's Reader Mode is a lifesaver, as is the EInkBro browser. <i>High-contrast text and black-on-white themes are strongly preferred.</i> Ironically, I use the Dark Reader extension to force <i>light</i> themes on numerous websites. The fact that the extension itself features a dark theme for its controls is ... unfortunate.<p>Generally for e-ink, I'd suggest:<p>- Use solid blacks and high-contrast whites where possible. This should <i>always</i> be the case for text if at all possible. Reversed white-on-black should be reserved for controls and emphasis.<p>- Line art and etchings render wonderfully. There's a reason Onyx features these in its marketing and screensavers, they look truly delicious on the devices. See for example: <a href="https://blog.the-ebook-reader.com/wp-content/uploads/2019/03/Onyx-Boox-Note-Pro.jpg" rel="nofollow">https://blog.the-ebook-reader.com/wp-content/uploads/2019/03...</a> and <a href="https://www.e-readerweb.nl/test/data/articles/images/lightbox/big/onyx-boox-nova-3_60587_5.jpg" rel="nofollow">https://www.e-readerweb.nl/test/data/articles/images/lightbo...</a><p>- For photographic and shaded images, halftoned or dithered images are an improvement over shading which is at best posterised. The high DPI (200--300 on most screens) achieves near-photographic quality at a modest viewing distance.<p>- For icons and UI elements, line- and solid-block art is much clearer and more distinctive than shaded or coloured elements. The top four lines of icons in this image are Onyx-provided applications, the lower rows are third-party apps. Onyx's icons are much better suited to the device: <a href="https://sm.pcmag.com/t/pcmag_au/review/o/onyx-boox-/onyx-boox-max-lumi_n9tp.1200.jpg" rel="nofollow">https://sm.pcmag.com/t/pcmag_au/review/o/onyx-boox-/onyx-boo...</a><p>- Yes, there are some colour devices available. They're the minority, saturation is limited, and hue fidelity varies markedly from original art. See: <a href="https://www.liseuses.net/wp-content/uploads/2020/08/onyx-boox-nova-2-color-liseuse.jpg" rel="nofollow">https://www.liseuses.net/wp-content/uploads/2020/08/onyx-boo...</a><p>Keep in mind that <i>all</i> display systems offer limited ranges of darkness, intensity, hue range, and saturation, and that their <i>best</i> capabilities can be severely degraded depending on viewing conditions. Emissive displays achieve their best results under dark ambient conditions, and become difficult or impossible to read under bright light or sunlight, whilst e-ink devices shine (or more accurately, <i>reflect</i>) at their brightest under direct sunlight.