Mercury, lead, and cyanopyridine are all chemicals with different uses, which are described below.
Mercury, also known as mercury, is a liquid metal at room temperature. In ancient times, it was often used in alchemy. The alchemists believed that it could refine the elixir of immortality. Although this pursuit never came true, the process of alchemy accumulated a lot of chemical knowledge. In the medical field, mercury was used to make thermometers and sphygmomanometers, using its properties of thermal expansion and contraction to accurately measure body temperature and blood pressure. However, due to the toxicity of mercury, such applications are gradually being replaced. In the chemical industry, mercury can be used as a catalyst to participate in specific chemical reactions, speeding up the reaction process.
Lead, soft and malleable. In ancient times, lead was often minted into currency, utensils, etc. Because of its relatively stable chemical properties, it can resist a certain degree of corrosion. In modern times, lead-acid batteries are an important application field of lead, widely used in automobiles, electric vehicles, etc., to provide power support. In addition, lead is also used in the manufacture of radiation protection materials, such as protective doors and protective clothing in hospital radiology departments, because it can effectively block X-rays and gamma rays.
Cyanopyridine, as a key intermediate in organic synthesis, occupies an important position in the pharmaceutical industry. Cyanopyridine is used as the starting material for the synthesis of many drugs, and a series of chemical reactions are used to construct the specific structure of drug molecules for the treatment of various diseases. In the field of pesticides, cyanopyridine can be derived from pesticide products with insecticidal, sterilization, weeding and other effects to ensure the healthy growth of crops and increase food production. At the same time, in the field of materials science, it can be used to synthesize new polymer materials, giving materials unique properties such as better heat resistance and corrosion resistance.

Mercury is soft and flowing, often in a liquid state, with a silvery white color and a metallic luster. Its density is quite high, about 13.6 times that of water. The boiling point of mercury is 357 degrees Celsius, and the melting point is minus 39 degrees Celsius. This property allows it to remain liquid at room temperature. However, mercury is volatile, and its vapor is toxic. If inhaled too much, it is harmful to the human body.
Water is a colorless, odorless, and transparent liquid. The density of water is one gram per cubic centimeter, which is the commonly used density reference standard. The boiling point of water is 100 degrees Celsius, and the melting point is zero degrees Celsius. Water has good solubility, and many substances can be dissolved in it, so it is often used as a solvent. And the specific heat capacity of water is large, when absorbing or releasing a lot of heat, its own temperature change is small, which plays an important role in regulating climate.
Aminonaphthalene is an organic compound. It has certain chemical stability, but under specific conditions, various chemical reactions can occur. Aminonaphthalene is mostly solid and has a specific crystal structure. Its physical properties, such as melting point, boiling point, etc., vary depending on the specific type of aminonaphthalene. Generally speaking, its melting point is relatively high, and it requires a specific temperature to melt into a liquid state. In addition, aminonaphthalene has certain solubility in organic solvents, but poor solubility in water.

Mercury is fluid and changeable, liquid at room temperature, shining silver-white light, and volatile. Its vapor is highly toxic and can quietly enter the body, damage the viscera, especially the brain and kidneys.
Water is the most soft thing, nourishing all things. Its nature is peaceful, colorless and odorless, and it is the source of life. It can dissolve many substances, participate in various biochemical reactions, and cycle in the world to maintain ecological balance.
Lithium amide has active chemical properties. It is a white crystal, which reacts violently when exposed to water, releasing hydrogen and generating lithium hydroxide. It has strong reducing properties and is an important reagent in the field of organic synthesis, often assisting in the progress of chemical reactions to produce various organic compounds.
Mercury is a liquid at room temperature, and water nourishes and is peaceful. Lithium amide is active and reacts violently. The chemical properties of the three are significantly different, and each has its own unique characteristics. In the field of nature and chemistry, each performs its own duties, showing the wonders of the chemical world.

There are many ways to synthesize mercury, lead, and cyanopyridine, and each method has its own advantages and disadvantages. In the era of "Tiangong Kaiwu", although the skills may be different, the principle can be passed. Today, in ancient Chinese, it is briefly described as follows.
The synthesis of mercury, in the past, or the method of using dansha for smelting. For dansha, mercury sulfide is also. The dansha is placed in a closed cauldron, calcined with charcoal fire, the dansha is heated and decomposed, and the sulfur and mercury are separated. Mercury gas rises, condensed when cold, and then mercury is obtained. "Tiangong Kaiwu" also contains that the dansha ore is excavated, crushed, and smelted in a furnace. The furnace is covered with a condensing vessel, and the mercury is steamed and gathered on it. This is the outline of the ancient method of smelting mercury.
As for the synthesis of lead, galena is often used as a raw material. In the case of galena, lead sulfide is also used. The galena is first roasted to convert it into lead oxide, and then reduced to carbon. In the furnace, the carbon reacts with lead oxide, and the carbon captures the oxygen in the lead oxide, and the lead is reduced. The ancients often used an earth furnace as a device and firewood as fuel to control the heat and make the reaction smooth. Lead ore enters the furnace, is roasted and reduced at high temperature, and the lead liquid flows out, and cools into lead blocks.
Synthesis of cyanopyridine, in the era recorded in "Tiangong Kaiwu", there is no clear record of this chemical. However, based on the current chemical principle, it can be obtained by the reaction of pyridine and cyanide reagents. If pyridine is used as the starting material, under appropriate catalyst and reaction conditions, a nucleophilic substitution reaction occurs with cyanide reagents such as potassium cyanide, and a cyano group is introduced to obtain cyanopyridine. However, this reaction condition is quite harsh, and factors such as temperature, pressure and reactant ratio need to be precisely controlled to obtain a higher yield product.

It is impossible to ignore the things used, such as oil, oxygen, and carbonyl.
Water, and flammable, often used as fuel and raw materials. Use it, and it will be a fire hazard. Mixing in the air, in case of open flame or high temperature, it is easy to explode. Therefore, it is convenient to store, and it is good to save the source of fire, the source of fire, and the fire is prohibited. The secrecy of the investigation should also be controlled. If there is a leak, it is the source of fire. Do not encounter fire, and quickly disperse it.
Oxygen is not flammable, but it is combustion-supporting. When used, there is no flammable material around. Oxygen and grease are connected, and it is easy to cause strong oxidation and reaction, causing fire and even explosion. Operator's hands, clothing, tools, etc., should not be contaminated with grease. And do not perform open flames such as welding in an oxygen-enriched environment. If necessary, it must be prevented.
Carbonyl, toxic and easy to burn. Use it, and use it through the operation to prevent inhalation of its steam. If you inhale it carelessly, you may be afraid of respiratory and mental systems. After using it, properly dispose of the leftovers, and do not deliberately dispose of it, so as not to pollute the environment.
As for the use of oxygen, oxygen, and carbonyl materials, you must be familiar with their properties, follow the operation requirements, and pay attention to safety to ensure safety.