A process of making bluprints or technical copies using light-sensitive diazo dyes, often used for reproducing architectural and engineering drawings.
From dye plus line, referring to the light-sensitive dyes used in the diazo process. This term emerged in the 20th century with the development of the diazo blueprint reproduction technology.
Before digital printing, architects and engineers relied on dyeline machines to copy their blueprints—the machine would flash light on special paper and the dye would react only where the original drawing had lines, creating perfect copies.
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