There is no such thing as “black light wavelength”—so why do black T-shirts, black crayons, and black marking pens look black? Investigate a variety of black ink markers, and find out why they look ...

Question: Which ink color (black or blue) is required for signing legal documents? Answer: Thanks a lot. I expected this question to require 5 minutes to research. An hour later, I am still reading… ...

Opt for a pen with the wrong color ink, and you could trigger a fraud alert or nullify the check. Surprisingly, the wrong color ink can be black, says Jim Angleton , president of Aegis, a ...

That's just what Scribble's upcoming Ink color picker pen is designed to let you do. ... white and/or black refillable cartridges. It's reportedly possible to reproduce over 16 million colors, ...