the phenomenon in an image which allows depth to be judged from the movement of near image elements relative to more distant ones. Traditional embossed holograms only display parallax from side-to-side, but the lack of vertical parallax is rarely noticed.


polyethylene terephthalate (polyester) – the base material used for most surface applied holograms.

Photopolymer holograms

holograms produced from photopolymer materials. The latter are materials that polymerise (the cross-linking of molecules) under the action of light energy and thus change their refractive index, and are used to record volume reflection holograms (see Volume Holograms)...


a substance that becomes insoluble (negative) or soluble (positive) under the action of light. A surface grating image is produced which is the first stage in the making of an embossed hologram.


a label construction made up of three layers: a face material, a pressure-sensitive adhesive, and a backing sheet coated with a release agent.