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Transparency and colour, the papermaker's innovation

The Canson family continued to focus on innovation like the Montgolfier before them. In the greatest secrecy, they invented tracing paper, this transparent medium which avoided the need for architects to redraw the same plan again and again. Then, they started colouring paper in the pulp, giving the sheets a lasting, uniform colour. 
Napoleon continued his conquest of Europe.
© Calque, Sandrine Alouf