Do precious metals like silver and gold have many uses besides making jewelry and storing value?
GOLD
-In modern times injectable gold has been proven to help to reduce the pain and swelling of rheumatoid arthritis.
-Gold alloys are used in restorative dentistry, especially in tooth restorations, such as crowns and permanent bridges.
-Gold, or alloys of gold and palladium, are applied as conductive coating to biological specimens and other non-conducting materials such as plastics and glass to be viewed in a scanning electron microscope.
-In photography, gold toners are used to shift the color of silver bromide black and white prints towards brown or blue tones, or to increase their stability.
-Gold is used as the reflective layer on some high-end CDs.
-Automobiles may use gold for heat insulation. McLaren uses gold foil in the engine compartment of its F1 model.
-The concentration of free electrons in gold metal is 5.90×1022 cm-3. Gold is highly conductive to electricity, and has been used for electrical wiring in some high energy applications (silver is even more conductive per volume, but gold has the advantage of corrosion resistance).
SILVER
-Photography used 24% of the silver consumed in 2001 in the form of silver nitrate and silver halides, while 33% was used in jewelry, 40% for industrial uses, and only 3% for coins and medals.
-During World War II the short supply of copper brought about the government's use of silver from the Treasury vaults for conductors at Oak Ridge.
-Mirrors which need superior reflectivity for visible light are made with silver as the reflecting material in a process called silvering, though common mirrors are backed with aluminium.
-Because silver readily absorbs free neutrons, it is commonly used to make control rods that regulate the fission chain reaction in pressurized water nuclear reactors, generally in the form of an alloy containing 80% silver, 15% indium, and 5% cadmium.
-Silver ions and silver compounds show a toxic effect on some bacteria, viruses, algae and fungi, typical for heavy metals like lead or mercury, but without the high toxicity to humans that is normally associated with these other metals. Its germicidal effects kill many microbial organisms in vitro, but testing and standardization of silver products is difficult.
-Wikipedia