However, in one-day internationals a mandatory ball change is now enforced after 34 overs because the white titanium dioxide dye rubs off the leather.

BBC: Pink balls set for one-day trials

One student came up with the idea of a quilt of tiny white balls in colored dye.

NEWYORKER: A New Page

Climbing two stories high, they punctuate the walls on both sides, and let in splashes of color that seem to dye the white walls around them.

FORBES: The Power of Light in La Sagrada Familia

Before printing, the embedded dye crystals are clear, so the ZINK Paper looks like regular white photo paper.

ENGADGET: Polaroid releases Z340 Instant Digital Camera, Gaga's Grey Label snapper still on the edge of glory

If you want black, or white, or any other colour, then you need to anodise so that you can dye that layer.

FORBES: Will Handling Your iPhone 5 Damage It? Maybe...