In 1513 Vasco Nunez de Balboa was informed about a gold-rich area and he immediately recruited men from Hispaniola to capture the territory. He also sent letter to the King of Spain but his requests for men were rejected at the insistence of his enemies.
This has no relevance to how many different colors the human eye can distinguish. Just as there are infinitely many numbers between 380 and 740 â including all of the fractions, of course â so there are infinitely many wavelengths between 380 and 740 nanometers â the visible spectrum of light.
The colors of light that the human eye is able to see range roughly from red to blue in color. Blue light has a higher frequency than red light. The light which has frequency just lower than red light is called infra-red, and the light which has frequency just higher than blue light is called ultra-violet. Both infra-red and ultra violet-light are beyond our eyes' range for efficiently detecting, however they are still very important.