Table 1.

Color properties of the artificial flowers

Color	Distance to background, hexagon units	Brightness contrast	Green contrast
UV-absorbing white	0.16	0.87	0.33
Blue	0.23	−0.22	−0.16
Yellow	0.35	−0.07	0.21
Lemon	0.31	0.31	0.30
Turquoise	0.10	0.32	0.08
Red	0.06	−0.94	−0.29
UV-reflecting white	0.07	0.77	0.26

Color distance is measured in hexagon units, brightness as the sum of the excitations of all three receptor types after adaptation to background, and green contrast as the specific excitation of the green receptor. In the analysis the absolute values of green contrast and brightness contrast were used.