YanfeiInteresting Things
The Historia Naturalis Liyue has an entry about a waterborne plant called the Horsetail. It claims that "The Horsetail is a medicinal herb that stands alone on the banks of Dihua Marsh. Its color is that of the clouds at sunset." Apparently, if you grind it into a powder and mix it into your ink, it makes your writing water-resistant. But it's a shame, I've been to Dihua Marsh at least a hundred times, and each time I end up with baskets and baskets of the common purple variety, but not a single one of the kind that the book describes.