Folium was used to illustrate illuminated manuscripts—and color the rind of a popular Dutch cheese. Courtesy of Paula Nabais / NOVA University In southern Portugal, an unassuming, silvery plant with ...

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 intensity, ...

Fans must have the right color ink to get an autograph from Claire Foy, it seems. "The Crown" actor recently turned down a fan's request for an autograph because it was blue, per a video initially ...

In the world of Hollywood and professional sports, where memorabilia can be worth thousands, even the smallest details matter — including the color of a pen. One question fans often ask: Why do ...