Another article for Gatorguy who thinks Apple does not need to put 75% pure gold by WEIGHT in a 18k piece.
"Apple’s patent application is for a method that allows them to make 18k gold that has, on a volume basis, less gold than regular 18k gold."
The karat measure of gold is based on the mass fraction. One hundred grams of 18k gold has 75 grams of gold and 25 grams of other material. If that “other material” is...