t's true to say that some artisans try to keep certain trade secrets. Lai Phu Ban, an artisan in Buoi Village in Tay Ho District, Ha Noi, is an example. He masters a unique technique for making sac phong paper, which is made from a special type of paper, called sac, and in the past this paper was used exclusively by kings and the royal court.

However, Ban wants to keep his technique secret. A Japanese once offered him thousands of dollars for an insight, but Ban refused.

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