The name of this compound is "** red copper alum **".
"Tiangong Kaiwu" says: "Where copper is used for the world, it comes out of the mountain and out of the furnace, and there is no red copper. Calamine or lead ginseng is used to change color to brass; arsenic and other medicines are used to refine into white copper; alum and nitrate are used to refine into bronze; guangtin ginseng is used to make red copper; lead and write (Xixie) are cast copper. The original material is just red copper." Although this compound is not detailed in Tiangong Kaiwu, it can be extrapolated from ancient knowledge of copper making and mineralogy.
Ancient copper smelting mostly involved copper ore. This compound contains copper elements. According to its characteristics, it may be related to the minerals involved in traditional copper smelting. Copper compound, multi-colored, such as malachite is green, the color of this compound may be the basis for naming. "Red", red, or because of its color. The word "alum" in ancient mineralogy often refers to sulfate minerals containing crystalline water. This compound may have a sulfate structure and contain copper ions, so it is named "red copper alum".
It is also considered in ancient books. Alum minerals are widely used, either in medicine, or in alchemy, dyeing, etc. This compound may also have similar uses. The name "red copper alum" not only expresses its chemical composition, but also contains the ancient people's understanding of its use and characteristics.

This compound is a wonderful substance in the world. Its main chemical properties are unique and diverse, and it exhibits extraordinary characteristics in various chemical reactions and natural phenomena.
First of all, considering its stability, this compound can maintain the stability of its own structure for a long time under normal environmental conditions, without being disturbed by external minor factors. The chemical bonds between its internal atoms are strong, just like closely connected barriers, which resist external interference, so that the compound can maintain its own integrity for a long time in a changeable environment.
Furthermore, its reactivity is also unique. When encountering specific reactants and suitable reaction conditions, it is like an excited spirit that quickly initiates a wonderful chemical change. Or meet with active metals, a displacement reaction occurs, showing its ability to attract and release electrons; or meet with oxidizing substances, on the stage of redox, a wonderful chapter of electron transfer is deduced, showing a unique valence state change and product generation in the reaction.
Solubility is also a major characteristic of this compound. In some organic solvents, it can quietly dissolve, as if it is integrated into the invisible embrace, interacting with solvent molecules to form a uniform and stable system. However, the solubility in water is very different, or insoluble, or slightly soluble. This difference in solubility is like two sides of its personality, showing a very different state due to different solvents.
In terms of thermal stability, when heated, the performance varies according to the temperature. Moderate heating may only cause weak internal vibrations, and the structure has not yet undergone major changes; however, if the temperature rises to a certain critical value, the chemical bonds may be overwhelmed, and the chemical bonds will break and recombine, causing the compound to decompose, generate new substances, and start a new round of chemical journey.
The main chemical properties of this compound are intertwined, and under the control of nature and man, endless chemical mysteries and wonderful changes are deduced.

This compound is useful in many fields. In the field of medicine, it can be used as a key ingredient in pharmaceuticals. Because of its specific chemical properties, it may participate in human biochemical reactions and assist in the treatment of diseases. Such as some difficult diseases, the compound may combine with pathogenic factors by virtue of its unique structure, or regulate human physiology, so as to play a healing effect.
In the field of industrial manufacturing, it also plays an important role. In the field of material synthesis, it can be used as a catalyst to accelerate the chemical reaction process, improve production efficiency, and optimize the properties of materials. For example, when manufacturing high-performance plastics, fibers and other materials, adding this compound can make the material tougher and more durable, expanding its application range.
In agriculture, this compound can be used to develop new pesticides or fertilizers. As a pesticide, it has inhibitory or killing effects on specific pests or pathogens to ensure the healthy growth of crops; as a fertilizer, it may provide key nutrients for plants, enhance plant stress resistance, and improve crop yield and quality.
In the field of scientific research and exploration, this compound provides an important research object for researchers. By exploring its properties and reaction mechanisms, it can promote the development of chemistry, biology and other disciplines, and lay the foundation for the birth of new theories and new technologies.
Furthermore, in the field of environmental protection, the compound may participate in the reactions related to pollution control. For example, for certain harmful pollutants, it can react with them, transforming pollutants into harmless or low-harmful substances, and assisting in the purification and restoration of the environment.

The method of making a certain alloy is especially exquisite. In the past, there were skilled craftsmen who wanted to make this alloy, but they tried their best to think about it, and visited the virtuous and capable, and finally obtained a good method.
The first method is in the selection of materials, and the pure hardware must be taken, gold, silver, copper, iron, and tin, each according to its own nature and measurement. Gold is soft and expensive, silver is clean and bright, copper is strong, iron is strong, and tin adjusts its fusibility. If the material is selected, it will be put into the crucible. A crucible, a special utensil, is fire-resistant and can be evenly heated. If it is blazed with charcoal fire, the fire needs to be moderate, if it is fierce, the material will be easily damaged, and if it is slow, it will melt for too long. When the hardware is all melted, the liquid flows like an injection, and the colors and luster are different and blend with each other.
At this time, the craftsman gathers his mind and holds a special pestle, stirring slowly in the melt to make the gold even. The rhythm of stirring is also fixed. If it is too fast, the liquid will splash, and if it is too slow, it will be mixed unevenly. After stirring, observe the color and check its temperature. If the color is warm, pour it into the mold. The mold is prepared early, and it is made according to the desired shape, either as a tool or as a decoration. When pouring the liquid, it should be steady and fast, so as not to make the liquid flow intermittent, resulting in defects.
After pouring into the mold, wait for it to cool down. The speed of cooling is also related to the quality of the alloy. It should not be suddenly cooled. It should be placed in a shady place to cool down. After cooling through, look at it from the mold. If there is a flaw, it can be ground or repaired to make it perfect.
After these steps, the alloy is formed. Its quality is strong and tough, and its color is beautiful and long-lasting. It can be used as a treasure weapon or a sharp blade, and it has a wide range of uses. This method of making alloys is really the crystallization of the wisdom of craftsmen. It is passed down to the world and will benefit future generations.

The physical properties of the compound are as follows:
Its color state may be crystal clear, just like flawless jade, or it may be a powder with uniform texture, delicate as dust. Looking at its color, or pure and white, like the first snow falling; or with an elegant color, like the morning glow smudging.
Smell it, its taste may be quiet and elegant, like the beauty of orchid, refreshing the heart; or no obvious smell, like still water, not making waves.
As for the touch, if it is solid, its texture may be hard like stone, indestructible; or soft like cotton, warm tentacles. If it is a liquid, it is fluidity or strong, such as the gurgling of a stream, going down the trend; or the viscosity is quite high, like glue, not easy to drip.
Its density is relatively normal, or it is as heavy as lead, stable and heavy; or it is as light as a feather, elegant and ethereal. And under light, or it has unique optical characteristics, such as refracting light and shining brightly; or absorbing light and hiding in the dark.
In terms of thermal stability, when heated, it is as solid as a rock, motionless, resistant to high temperatures and does not melt; or when heated slightly, its shape changes, like ice melting in the warm sun. In different solvents, the solubility also varies. In some solvents, it can be quickly dissolved, such as salt entering water, which is invisible; in other solvents, it refuses to blend, just like oil and water, which are distinct. These are the common physical properties of this compound.