78: The day we watched all this they were experimenting to make particularly strong paper to be used for paper currency. To do this they were adding to the mulberry fibers an amount of ramie fibers. These fibers come from a plant that grows plentifully where there is very wet soil in the Himalayan foothills. It looks rather like giant mint. The actual ramie fibers are the skin on the stalks which must be decorticated by removing it from the tough stalk. This is done by hand with wooden hammer so it is very labor intensive and very expensive. But the resulting fibers are the strongest known. The paper they were making was impossible to tear and extremely good for paper currency as a result. Later we found that they made lengths of cloth of ramie fiber, especially in Bhutan. I bought some shirts made of this fiber. That was 69 years ago and those shirts are still almost as new. They only get softer and more luxurious with each laundering.