The adjective iridescent can be used, according to the first meaning mentioned by the dictionary of the Royal Spanish Academy (RAE ), to qualify what reflects or exhibits the colors found in the rainbow .
To understand what the concept alludes to, therefore, it is convenient to focus first on the notion of rainbows or rainbow . This is the name of optical phenomenon which occurs when sunlight is reflected or refracted in water spray, forming an arc that exhibits bands of the seven essential or elementary colors.
The rainbow usually appears when it rains and the sun's rays reach the drops that are in the environment. In those cases, the people they observe an arch in the sky with the colors violet, blue, cyan, green, yellow, orange and red.
The iridescent, in short, shows these shades . The term also refers, in its second meaning, to what generate sparkles .
Something iridescent has the property of exhibiting different shades of light according to the angle of observation. The bubbles or soap bubbles, the side of a DVD that is reproducible and oil spots, for example, are iridescent.
The iridescence is due to the numerous light reflections that occur in the surface , with different wavelengths. This makes whoever sees the object perceive different colors according to their point of view.
The butterfly wings They are iridescent, to name another case. That's why they seem to change colour Depending on the location.