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January 28, 2020

One Of The Best Optical Illusions You Will See In Your Life

An optical illusion (but sometimes it is called a visual illusion) is characterized by visually perceived images that differ from objective reality.

The information gathered by the eye is processed in the brain to give a perception that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological ones that are the effects on the eyes and brain of excessive stimulation of a specific type (the things that stimulate the brain are: brightness, color, size, position, tilt, movement), and cognitive illusions, the result of unconscious inferences.

Perceptual constancies are sources of illusions. Color constancy and brightness constancy are responsible for the fact that a familiar object will appear the same color regardless of the amount of light or color of light reflecting from it.

An illusion of color or contrast difference can be created when the luminosity or color of the area surrounding an unfamiliar object is changed. The contrast of the object will appear darker against a black field that reflects less light compared to a white field even though the object itself did not change in color. Similarly, the eye will compensate for color contrast depending on the color cast of the surrounding area.

Man With A Golden Shirt

Gold is a dense, soft, shiny, malleable and ductile metal. It is a chemical element with the symbol Au (aurum in Latin, meaning glow of sunrise) and atomic number 79.

Gold has a bright yellow color and luster traditionally considered attractive, which it maintains without oxidizing in air or water. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements solid under standard conditions. The metal therefore occurs often in free elemental (native) form, as nuggets or grains in rocks, in veins and in alluvial deposits. Less commonly, it occurs in minerals as gold compounds, usually with tellurium.

Gold resists attacks by individual acids, but it can be dissolved by the aqua regia (nitro-hydrochloric acid), so named because it dissolves gold. Gold also dissolves in alkaline solutions of cyanide, which have been used in mining. Gold dissolves in mercury, forming amalgam alloys. Gold is insoluble in nitric acid, which dissolves silver and base metals, a property that has long been used to confirm the presence of gold in items, giving rise to the term the acid test.

Gold has been a valuable and highly sought-after precious metal for coinage, jewelry, and other arts since long before the beginning of recorded history. Gold standards have been the most common basis for monetary policies throughout human history, being widely supplanted by fiat currency starting in the 1930s. The last gold certificate and gold coin currencies were issued in the U.S. in 1932.

Making of Gold Bullion

If gold is what warms the cockles of your heart, this slide show is going to be pure bliss for you! Just check out everything gold- from gold granules and gold bars to lots of ancient jewelry that then gets converted to gold bullion!

Firstly, all the jewelry is collected in special containers in furnaces and heated at the extremely high temperature of 1064 degrees Celsius. The gold needs to be melted completed to be able to go further in the process. As the temperature increases, the density of gold decreases and it becomes a molten metal of bright yellow, slightly green color. The molten metal is poured into casts, where it becomes an intense orange yellow color, until it cools. This is then engraved with its weight as well as trademarked. 999 per thousand gold is equal to 24 carat purity, the most desirable in gold production.

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