"Black is the most difficult color to match," he said.
Dark red comes from tamarind bark; for black, the most difficult color to achieve naturally, she experiments with barks and mud.
The gecko was green, another difficult color to get out, and the wedding was imminent, so Dr. Messina suggested removing just the head.
The crux of the problem is that green is such a difficult color to manufacture that toxic substances are often used to stabilize it.
When I first saw it, I didn't like it — yellow is a notoriously difficult color to pull off — but later, as she walked up the stage to accept her Oscar for Best Supporting Actress, I loved it.
It was also sidetracked for a period of time for doing an almost equally difficult color project — one of my worst failures, which I consider a going to school.
The exact tone of blue, which they decided would be "process blue" (a shade lighter than Duke's and darker than North Carolina's), was the most difficult color to choose.
The difference between groups was significant (group effect, F1,14 = 10.1, p<0.01; group × trial interaction, F2,28 = 3.6, p<0.05), thus showing that for a perceptually difficult color discrimination, associating quinine with the CS− facilitates discrimination by free-flying honeybees.
Difficult color decisions consisted of three identical color patches and a slight variant, whereas easy color decisions used a different color for the nonmatching item.
Black is a difficult color to photograph well, so select someone from the shelter staff or volunteers who loves a photography challenge!
