Alcoholic beverages like beer are brown in color because clear glass allows ultraviolet light to penetrate which can alter the flavor profile. Bottles inevitably became tinted brown to prevent ultraviolet light from achieving full penetration. After World War II, green bottles became popular due to shortages of brown glass
Ballet shoes and tights were originally created only in pink in an attempt to match the skin color of ballerinas who wore the apparel. Because ballerinas now run the gamut of a wide array of skin tone, hue, and color, bronze and brown ballerina slippers have become available. Prior to this, ballerinas would commonly use makeup and other aids to color their shoes
When brown color changes and dark spots appear on old documents and the pages of old books, these blemishes are referred to as “foxing”. The term “foxing” is based upon the term “ferrous oxide” borrowing the letter “f” in “ferrous” and the letters “ox” in “oxide”. Foxing occurs when paper becomes exposed to humidity and as part of the oxidation process when iron, copper, or other metallic substances within the pulp from which the paper was made are exposed to oxygen to form iron oxide which is rust