Graeme −> Odds and Ends −> Tricks −> Color name 

Look at this chart, and say the COLOR, not the word:

YELLOW   BLUE   ORANGE

BLACK   RED   GREEN

PURPLE   YELLOW   RED

ORANGE   GREEN   BLACK

BLUE   RED   PURPLE

GREEN   BLUE   ORANGE

Left-Right Conflict--
Your right brain tries to say the color, but
your left brain insists on reading the word.