Construction and Printing: Blueprints to Site Signage

Before CAD, before BIM, there was a genuinely clever chemistry trick for copying a technical drawing without redrawing it by hand — and construction sites have relied on printed information, in one form or another, ever since.

The Blueprint: A 19th-Century Workaround

The blueprint takes its name from Sir John Herschel's cyanotype process, developed in 1842 — a chemical reaction that produced white lines on a deep blue background when exposed to light. The first commercial cyanotype paper appeared in Paris in 1872, and the first commercial blueprinting machine debuted at the 1876 Philadelphia Centennial Exposition. For over a century, blueprinting was the cheapest, most reliable way to copy a technical drawing accurately — no redrawing required, just light and chemistry. Diazo "whiteprint" processes displaced true blueprints from the 1940s, and CAD software finally displaced hand drafting itself from the 1980s onward.

What Never Really Changed: Site Print

Whatever's happening on the drawing board, a construction site itself has always needed printed information physically present: plans pinned up in the site office, health and safety posters where workers actually see them, site signage marking hazards and access points, and material labels that don't come off in the rain.

Where This Shows Up in What We Print

Site signage and H&S posters sit squarely in our large format & signage range — rigid boards built to survive outdoor site conditions. For crews needing branded or hi-vis workwear on site, see our branded workwear page, which covers hi-vis class requirements alongside logo printing.

Frequently asked questions

Where does the term "blueprint" come from?

Sir John Herschel's cyanotype process, developed in 1842, which produced white lines on a blue background — a cheap, accurate way to copy technical drawings before photocopying or CAD existed.

When did blueprints stop being used?

True cyanotype blueprints were largely displaced by diazo "whiteprint" processes from the 1940s, with CAD software eventually displacing hand drafting entirely from the 1980s onward.

Do you print site signage and H&S posters?

Yes — rigid outdoor sign boards suited to construction site conditions, through our large format printing range.