heliotype

Thân thiện

A librarian uses a heliotype to reproduce an old document.

Definition

1. Noun:
   • A duplicating machine or process that uses a gelatin-coated plate to transfer ink and create a copy. It is an early form of photomechanical printing.

Usage

• The word heliotype is a technical, historical term. It is used to refer specifically to a now-obsolete printing technology from the 19th century.
• It functions as a countable noun (e.g., , ).

Examples

• The library's archive contains several heliotypes of 19th-century architectural drawings.
• This image was reproduced using the heliotype process, which was a precursor to modern offset printing.
• He examined the heliotype carefully, noting the characteristic texture of the gelatin plate's impression.

Advanced Usage

• The term can be used attributively (like an adjective) to describe objects produced by or related to the process.
  • The collection features heliotype reproductions of famous paintings.
  • They specialized in heliotype printing for scientific publications.

Variants and Related Words

• Collotype: A very similar, often synonymous, photomechanical printing process that also uses a gelatin plate. In modern usage, "collotype" is more common than "heliotype."
• Photogelatin process: Another general name for this family of printing techniques.

Synonyms

• Collotype
• Photogelatin print

Notes on Meaning

• The core meaning of heliotype is tied to its specific historical method of duplication. It is not a general term for any copy or photograph. The reference to "gelatin plate" and "ink" is central to its definition.

Học thuật

Noun

1. duplicator consisting of a gelatin plate from which ink can be taken to make a copy

Từ đồng nghĩa

• hectograph