Metallic foil

Metallic foil produces a highly surfaced/polished finish and has been used for decorative purposes on stamps. It can also provide a measure of security since it cannot be cheaply reproduced by forgers.

Plain surfaces have been bonded to paper to be further laser-etched with a holographic 3-D image. See: 3-D stamp.

Otherwise, it has been used for design elements including some Elizabeth II heads on some British and Commonwealth stamps.It has also been used for round coin stamps on thin card.

The process involves controlled heat, and can be finicky with the possibility of a lot of spoilage. Some missing spots in the foil are possible making for some interesting EFOs. However, the foil can be removed. So the errors missing gold foil are ones that completely missed the foil application step. However, if the printer was someone like House of Questa or Format Security, the chances are very good that the errors were probably sold and controlled by those printers.  File:Tongo 1d coin.jpg|Tonga 1d coin File:SWA Biblia flaw.jpg|South West Africa 12½c BIBLIA with foil partly missing 

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