In the cold winter, you can go to the hot spring area for a small vacation during holidays or spare time, which not only warms your body but also warms your heart. But if you don't have time but want to soak in hot springs, as long as there is a bathtub at home, you can also buy commercially available hot spring powder and add it to the prepared hot water pool, and you can simply soak in hot springs at home. I wonder if readers have ever thought about how these hot spring powders came from? What are the ingredients in it? The information on these issues is not very complete, and there are many urban legends. The author will use the knowledge banner design learned in college and my own imagination to make a brain-opening speculation, and show you the secrets behind the hot spring powder! (This article does not represent the actual production technology and methods of the relevant product manufacturers on the market) The effect of hot springs Let's start talking about the effect of hot springs! A casual search on the Internet reveals many articles touting the benefits of hot springs, especially the effects of hot springs on beauty and exfoliation. However, after a careful search by the author, I found that there are not many systematic scientific studies, but there are several explanations that the author agrees with. We first roughly divide Taiwan's hot springs into two categories. One is the sulfur springs distributed in the Datun Volcano Group and containing hydrogen sulfide, sulfate and other acidic water. For example, the sediments of Beitou sulfur springs have a beautiful name. , called "Yuhua" or "Yunohana", it is said that it resembles snowflakes when suspended in water; the other type is a slightly alkaline sodium bicarbonate spring distributed in the metamorphic rock area of ​​the Central Mountains.