Program that uses density colouring to show ink/dye or a glowing surface. Keys:
- Q or Escape = Quit
- Click left/right = Swirl left/right
- Shift+click left/right = Dilate/Contract
- Space = Invert colouring (black or white background)
Try it now! - press open/run if the browser prompts you (Windows 8 sometimes requires you to click 'More info' first).