The Japanese love to soak in Onsen... hot springs that bubble up from the ground, often milky white or green in color, tinted by minerals in the earth. But now many have been dismayed to discover that some of the springs don't owe their color to natural minerals, but instead to far more mundane ingredients. Namely, bath salts. Japan Today notes
, "In Kagoshima Prefecture, a hot spring famous for its unusual green color was revealed to be the result of dissolving household "Bath-Clean" bath salts into the water. Further claims of "fake onsens" have been surfacing continuously over the country."