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Exceptional case: the cyanotype

A cyanotype can be recognised from its cyan-blue colour and white lines. The chemical reaction of iron salts applied to paper with light creates a deep blue colour. It was a cheap way to copy drawings in the 19th century.

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The difference between a cyanotype, blueprint and photogram

A blueprint looks very similar to a cyanotype, but was used more for technical drawings and plans.

For botanical studies, sheets of paper were treated with a light-sensitive product and placed in the sun with plants or other natural objects on top. The bright blue print left on the paper is called a photogram.

Digitisation

Old cyanotypes always have heritage value. You should therefore contact your local heritage society for more info about how to preserve, store and digitise your valuable find.

Did you know …

… the blueprint process originated as early as 1842, but is still used by photographers and artists today?

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Met de steun van Vaal nderen en EFRO europees fonds voor regionale ontwikkeling