Here's what I pulled out of the gold institute website. http://www.goldinstitute.org/uses/
I don't know where you got that story about pure gold being white Giancarlo! gold is yellow in its purest form, they must know the stuff!!
Gold's superior electrical conductivity, its malleability, and its resistance to corrosion have made it vital to the manufacture of components used in a wide range of electronic products and equipment, including computers, telephones, cellular phones, and home appliances.
Gold has extraordinarily high reflective powers that are relied upon in the shielding that protects spacecrafts and satellites from solar radiation and in industrial and medical lasers that use gold-coated reflectors to focus light energy. And because gold is biologically inactive, it has become a vital tool for medical research and is even used in the direct treatment of arthritis and other intractable diseases.