The Secret of Red Salt
There are wonders in the world, which are related to the change of red salt. I have tasted that there are aliens who can use ingenious methods to make a thing appear in the liquid of red salt.

At the beginning, prepare the red salt (Potassium Ferrocyanide), melt it with water, and obtain a clear liquid. Take other things, or stones or wood, and immerse them in it. After a while, watch its color change. If it encounters iron, the liquid gradually turns blue, like the dye of the blue sky, the color is strange and indescribable.

Everyone is amazed, and the reason is that the red salt and the essence contained in the thing, touch and turn into this different color. This is not a technique of ghosts and gods, but the nature of things and the wonders of reason.

Craftsmen use this technique as a technique, either making strange things or dyeing utensils. The color is unique and does not fade for a long time. People from all over the world, hearing this strange thing, come to observe, in order to solve the confusion in their hearts and explore the secrets of nature.