Saurav Purohit on Twitter: "🔹CSS Duotones This website helps to create dual tone effect using css. https://t.co/wh9MUMc2RH" / Twitter
CSS Color Tint Overlays
Color overlay filter proposal - CSS - WICG
Custom CSS Filters for emulating colour blindness - Nick Palmer - palmr.co.uk
html - CSS filter: use hue rotation to change certain colors only (like Photoshop Hue/Saturation) - Stack Overflow
Ahmad Shadeed on Twitter: "Say hello to the CSS tint() color function! 🎉 Pick a color and a percentage, and you're good to go. It works by altering the color L value.
CSS Filter | How CSS Filter Works with Code and Output?