Boiling Substances for Indicator Liquid
The boiled matter is a liquid, to give an indication
All things in the world have their own characteristics, or the color changes when exposed to acid and alkali. It can be made into an indicator liquid, to reveal the acid and alkali of the substance. If you want to get this liquid, what should you cook it with?
Common flowers and plants, such as purple cabbage, have a purple and brilliant color. Take a few leaves, wash and cut them finely, place them in a kettle, fill them with water, and cook them over fire. When the water boils, the color of the cabbage gradually melts into the water, and the liquid is purple at first, or it varies depending on the time of cooking, or the amount of matter. This liquid is red when it encounters acid, and green when it encounters alkali, which can be an indication of acid and alkali.
And like the flower of the morning glory, the color is purple and blue If you pick the flowers and boil them in a kettle, you will also get liquid. The color of the liquid is blue or purple, if it encounters acid, it will be red, if it encounters alkali, it will be blue-green, and the nature of acid and alkali can also be distinguished.
Another example is comfrey, boiled in water, its liquid is purple. When it encounters acid, it is light in color, and when it encounters alkali, it is also a useful indicator liquid.
And so on, all can be boiled to get liquid, as an indication, to explore the nature of the substance, and to observe the change of acid and alkali. Cooking is a liquid, although the method is simple, it is infinitely wonderful.
