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HMG Glossary

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Glossary, l

Letterpress to Long Oil

1 Letterpress
The oldest and simplest of all the printing processes. It is a "relief process", with the image area standing out of the printing plate. Paper is then placed directly onto the inked relief surface, and by applying pressure the ink on the plate transfers from the image to the substrate.
2 Linseed Oil
Oil from the seed of the flax plant historically used after heat treating as a medium for varnish and coatings.
3 Litho
Litho printing is a planographic process. This means that the image area and the non-image area both lie on the surface on the surface of the printing plate in the same place. It works on the principle that oil and water won't mix. The printing plate is treated to produce ink-receptive areas for the image and water-receptive areas for the non-image. The plate is first wet with water, then immediately by ink, creating the desired image in the ink-receptive area.
4 Long Oil
An alkyd resin containg more than 60% of a vegetable oil (linseed oil, soya oil etc...)