The making of rainbow hologram
can be divided into two processes: making of a master hologram and making of a rainbow hologram
* HP Indigo Digital Topcoated Face-stocks: Our new line includes bright white semi-gloss, bright white gloss BOPP, rainbow hologram
, silver metallized paper, wine label and clear high gloss BOPP.
By simultaneously allowing a second beam of light (the reference beam) to overlap with this image on the H2 plate, a second interference pattern is generated which records a rainbow hologram
of the projected image.
(Ed: It was several years later, in a collaboration with local artist Harriet Casdin-Silver, that Benton realised the significance of his 'white light rainbow hologram
In the rainbow hologram
, the surface relief micro-structure behaves as a diffraction grating.
The presentation highlighted how the embossed rainbow hologram
technique, introduced in the early 1980s, became the main hologram type used on products.
So the reflection, or volume, hologram is viewable in white light as either a monochrome or a true colour image, but it can also retain some of the rainbow hologram
This uses a rainbow hologram
Ultracure OPP to provide a 'Northern Lights' backdrop to the silhouette of a caribou.
The process creates a transmission, or rainbow hologram
, but by depositing a thin aluminium layer on the reverse side, this can be viewed in reflection.
Unlike rainbow holograms
, volume holograms do not require any additional origination steps to enable them to be viewed using ordinary white light.
He adds that making Glossmarks is much simpler than producing rainbow holograms
of the type that already appear on credit cards and concert tickets.
This enables the production of a completely new type of hologram that, in contrast to conventional rainbow holograms
, has pastel structural coloration.