There are two reasons for this. One is that our eyes are much less sensitive to blue light – peak sensitivity is in the yellow-green region of the spectrum, so if all markers were of equal ...

Small expects sales to double this year, to $10 million. Thanks to CTI's ink, the mountains on Coors Light cans turn blue when the beer reaches optimal drinking temperature (roughly 43-50F).

When light hits the ink of a blue pen, the ink reflects blue light and absorbs other colours, which is why the ink appears blue. Highlighter pens contain chemicals that absorb visible light as ...