Foiling involves applying a layer of (in this case metallic) embellishment to patterns and designs. During the induction we were shown how to apply a metallic surface finish to various images we had created on either paper or fabric.
One of the methods allowed you to simply lay the metallic foil sheet over a photocopied image and then apply heat, this allowed the foil to stick to the carbon in the photocopied image and so leave a shiny decorative surface.
Another method involved using the screens that I have previously used during screen printing to apply a layer of glue-like substance to a sheet of paper and a piece of fabric. The foil was then apply to these mediums using the same method of the heat press.
The method using the photocopying seemed to be much more reliable (as long as your photocopier is reliable) as it allowed for much less human error in comparison to the other method using the screens which can be less consistent.
The technique would be excellent for both representing an image in itself and also adding features to an existing image. Some subtle additions could be to use the colourless, transparent foil sheeting to add almost hidden detail to an image.