Who invented the wet-folding technique in origami?

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Red origami crane with outstretched wings and pointed beak, displayed against a solid black background. — origami An origami crane.

The wet-folding technique in origami was invented by the Japanese master Akira Yoshizawa.

In this technique, the paper—which contains a water-soluble glue known as sizing—is dampened slightly before folding. This moisture allows the paper to be shaped into soft, organic curves that harden and become more durable as the material dries.1