retinol vs hyaluronic acid
What are some'retinol horror stories'?
Another common retinol horror story is the long - term negative impact on skin sensitivity. Some users have reported that after using retinol for a while, their skin became overly sensitive. Simple things like applying a regular moisturizer or being exposed to a bit of wind would cause their skin to sting and turn red. It's like the retinol disrupted the skin's natural barrier function and made it more vulnerable.
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2024-11-16 13:29
Can colchinic acid tablets lower uric acid?
Colquin tablets couldn't lower UA. Colchiine was mainly used to treat acute episodes of gouty Arteritis and prevent acute episodes of relapsing gouty Arteritis. It had anti-inflammatory and pain-relieving effects.
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2026-04-05 05:31
Acid cement
Silicate cement was a kind of hydraulic cementation material, and its main component was calcium Silicate. According to domestic standards, the cement was made of cement clinkers, limestone or pulverized blast furnace slag, and a suitable amount of fine plaster. There were two types of portland cement. One was portland cement without mixing materials, and the other was portland cement with mixing materials. The portland cement has the characteristics of fast setting and hardening, high early strength, and good frost resistance. Ordinary portland cement was a type of portland cement. It had a fast hydrating reaction speed and high early and late strength. The composite portland cement is a hydraulic binding material made of portland cement grog, two or more mixed materials, and an appropriate amount of plaster. White portland cement is a kind of hydraulic binding material made of portland cement with less iron dioxide content. In general, portland cement was a common cement type with many types and uses.
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2025-01-07 13:38
terephthalic acid
Teremartial acid, also known as p-sulfuric acid, had a molecular formula of C8H6O4, and was the most widely produced dicarbonic acid.
It was solid at room temperature, sublimated when heated above 300 ° C, and melted at 427 ° C when heated in a closed container. It is white crystal or powder.(g/mL,20 ° C) is 1.51, melting point is>300 ° C, flash point is 260 ° C, gas phase standard combustion heat (kJ·mole- 1) was-3329.50, the gas phase standard claimed heat (heat)(kJ·mole- 1) was-717.89, the crystal phase standard combustion heat (heat)(kJ·mole- 1) was-3189.42, the crystal phase standard claimed heat (heat)(kJ·mole- 1) was-816.13, and the vapor pressure (mmHg, 20oC) was <0.01. It is not dissolved in water, carbon dioxide, ether, and acetic-acid. It is slightly dissolved in alcohol and is dissolved in soda.
Low toxicity, its toxicity is basically the same as that of ortho-acid. For rats, the oral lethal dose was 6.0g/kg, and the lethal dose was 800g/kg. The irritation to the skin is not as strong as that of orthoactic acid, and it does not show any signs of sensitizing. However, for allergic people, contact with this product can cause rashes, bronchial asthma, or bronchitis. Dust masks should be worn during the operation. The maximum permitted concentration in the air is 0.1kg/m3.
It was a raw material for the production of pet (especially pet), synthetic resin, synthetic fiber, and plasticizer. It could also be used as a reagent for analytical analysis. In the industry, the high-temperature liquid-phase fermentation method with p-rex as the raw material was mostly used for production. There were also production methods such as low-temperature p-rex fermentation method, the substitution method of sulfuric acid, and the method of methylethene disproportionation. In the high-temperature liquid-phase oxidization method with p-rex as a raw material, the sulfuric acid was used as a catalyst, the co-catalyst was Cobalt acetate-Manganese acetate-Manganese acetate-Tetra-Bromo-Ether as a co-catalyst, and the sulfuric acid was generated at 221 - 225 ° C and 2.5 - 3.0MP. The sulfuric acid was in the form of mud, and after centrifugal separation and drying, the crude sulfuric acid was obtained, and then the fiber grade sulfuric acid was obtained through subsequent treatment.
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2026-02-01 19:25
benzoic acid
Its chemical formula was C6H5COCH. It was the simplest aromatic acid, a scale-like or needle-like crystalline organic compound. The molecular mass was 122.12 g/mole, and the density was 1.3 g/cm.
It is slightly dissolved in water, but it is also dissolved in organic liquids such as alcohol, aether, chlor-3-ol, and so on. It is weakly acidic, and its acidic property is stronger than that of ordinary fatty acid. Its thermal stability is poor. Its chemical properties depend on the aromatic ring and the aromatic group. The aromatic ring can undergo substitution reaction, dehydration reaction, and decylating reaction; the aromatic group can react with alkalium, alcohol, chloridizing agent, etc. Powder or granules of sulfuric acid may cause a dust explosion when mixed with air.
It was widely used in the chemical industry. It could be used in the production of phosphorus acid, phosphorus dioxide, and hexagon. It could be used in the production of dimple, dipropylethlene, and dipropylethlene to form an ester. It could be used as a antiseptic to kill bacteria. It could be used to dip small steel packaging paper and water-based paint to prevent corrosion of parts. It could be used in the anti-freezing agent of engine coolants, and it could be used in combination with NaNO3 to protect cast iron. It can be used to improve the performance of various alkyds; it can be made into an ointment with Salicolic Acid to treat skin mycoses and superficial mycoses; it can also be used as a dye carrier. In free form or in the form of salt and ester, it is widely found in the bark of wild black cherry trees, cranberries, dried plums, chrysanthemum, plum, laurel, and cloves. Herbivores 'urine contains a small amount of the gly lic acid derivative of the sulfuric acid, namely, the methylam acid.
The toxicity of the sulfuric acid was relatively low, but the crystallites or dust would irritate the skin and the respiratory system. If it splashed into the eyes or on the skin, it would quickly solidify and rapidly burn the skin. Inhaling the high-temperature vapor of sulfuric acid can cause spasmodic cough, nasal sinusies, and sometimes nausea and vomiting. Animals would be anesthetized, tremble, and twitch after being poisoned.
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2026-01-21 20:22
malonic acid
Malonic acid, also known as malonic acid, carrotonic acid, betainic acid, the molecular formula is HOOCCH <2 <COOH, a white flake crystal. Its density is 1.63 g/cm 3, melting point is 135.6 ° C, boiling point is 140 ° C, and it will decompose when it reaches the boiling point. Malonic acid is easily dissolved in water, alcohol, and ether. It can sublimate in a vacuum, and its dissolution in water is 74%. It has poor thermal stability and is easy to decompose into carbon dioxide and sulfuric acid when heated. The methyls in the molecules are more active and can undergo various types of reactions. In the industry, it was commonly used to prepare malonic acid by the method of decomposing cyanaconic acid. Malonic acid was mostly used to make drugs. It could damage the skin and mucus membranes, but the degree was not as good as that of sulfuric acid. In addition, malonic acid exists in the form of calcium salt in the beetroot, and the scale deposited in the concentrating tank of the sugar beets is called calcium malonate.
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2026-01-16 16:04
Can you share some'retinol horror stories' you've heard?
There was a case where a person's skin got so inflamed from using retinol that they had to stop using all skincare products for a while. The inflammation was so bad that it took weeks for the skin to calm down, and during that time, they had to be very careful about what they ate and how they exposed their skin to the environment.
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2024-11-17 02:07
Is 'A is for Acid' a true story?
Yes, it is. 'A is for Acid' is based on real events and characters.
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2024-10-15 09:02
lead acid and water
The correct way to add water to a lead-acid battery is to use a plastic funnel to slowly pour distilled water or Deionized water into the battery to ensure that the water does not splash on the battery casing or other components, and to avoid pouring water into the battery's charging port or other non-water-adding ports. After adding water, close the battery cover in time and screw it tightly to prevent the water from evaporating. Before adding water, first check whether the battery level is lower than the indicator line. Only when the liquid level is lower than the indicator line do you need to add water. Use distilled water or Deionized water to add water. Do not use tap water or other water containing impurities to avoid affecting the battery's working effect. When adding water, pour water slowly to avoid splashing on the battery casing or other components to avoid short circuit or other failures. Adding too much water would cause the battery to overflow, reduce performance, accumulate water in the box, and corrode. In serious cases, it might cause the battery to short-circuit. Therefore, it is necessary to add a small amount of water many times. It is strictly forbidden to add too much water to exceed the maximum liquid level.
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2025-01-11 04:23
Is aqua the strongest acid?
No, it wasn't. Although the aqua acid was extremely corrosive and could dissolve precious metals such as gold and platinum, the strength of the acid was not completely the same as the strength of the corrosion. In the field of chemistry, there were other acids that were more acidic than aqua dire, such as superacid such as fluorantimonic acid.
Click on the link below to read "The Strongest in History" comic
1 answer
2026-02-16 09:57
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