Gold filled is an actual layer of gold-pressure bonded to another metal. Gold filled is not to be confused with gold plating as filled literally has 100% more gold than gold plating. Gold filled is much more valuable and tarnish resistant. It does not flake off, rub off or turn colors. There is enough gold that it can be soldered, learn tricks and techniques to solder Gold Filled wire by checking out our classes page and sign up today!