Evolution of human colour vision that are found between 450 and 625. Individuals with various forms of colour blindness such as deuteranopia and protanopia are missing human middle wavelength sensitive or long wavelength sensitive opsins. Their minimum wavelength differences are <5 but only at around 500. Protanopes, who are missing long wavelength sensitive cones, are unable to distinguish between colours in the green-yellow-red section of the electromagnetic spectrum. They find yellow, red and orange colours to have much lower brightness when compared to a trichromat. The dimming of these colours can result in confusion in many cases, such as when attempting to identify red traffic
Colour whist Colour whist Colour whist ("whist à la couleur" or "whist belge" in French or "Kleurenwiezen" in Dutch) is a Belgian variation to the card game whist. In contrast to the normal game of whist, the trump colour is determined by a bidding process rather than being the last card on the stack. The trump is determined during a first phase in the game. A player "asks" for a colour, and the next players can pass, join him, ask another colour or ask another game. The colours have a hierarchy: hearts is the most valuable, followed by diamonds, followed by clubs