The difference between cold perm and perm is that the principle of cold perm is that disulfide bonds in hair are decomposed under the action of electricity and water, and then two sulfur groups in hair are staggered under the physical action of curling to form a new shape, and then the split sulfur groups are formed into new disulfide bonds in new positions by oxidant, thus forming a new texture.
The principle of perm is: first, cut off all the bonds in the hair, and the far infrared rays generated by heating are water bonds to produce memory, and then recombine to produce a new shape. Finally, the hair is oxidized and shaped with styling agent.
Although they are all perms, the operation process and the effect after perming are still very different.
The difference between cold perm and hot perm-the difference of softening degree
Cold perm medicine can only change 70%-80% of the chain structure. The effect of perm is that the pattern curls in wet state, and 20%-30% of the chain structure returns to straight hair after natural drying.
When the blanching agent softens, it can change the chain structure of 100%, and the effect after blanching is that the pattern is not good in wet hair state and the pattern elasticity is good after dry hair.
Distinguish the different patterns after secondary ironing.
Cold perm Because the chain lock structure is not perfect, you must use moisturizing styling products, such as gel water, gel cream and other styling products, so as to maintain the perm effect of your hair style.
Modeling products with increased elasticity should be used within 15 days after blanching, and modeling products cannot be applied after 15 days. The effect is better in dry hair state.
Difference 3: Different heating methods.
Cold perm is the use of body temperature and room temperature for perm. The main component of one dose is ammonia, which aims to expand the scale tissue, facilitate the penetration and absorption of vulcanizing agent and change the original state of the chain. If the room temperature does not reach 15? C, can be properly heated, the heating temperature is set at 40? Below C. Excessive cold perm and heating will destroy the protein in the hair, making the hair stiff and inelastic.
Blanching blanching must be heated, which can be divided into internal heat, external heat and internal and external heat. The purpose is to reconstruct the memory of water element in the cut hair. The water element should be in 100? C - 140？ C can produce memory recombination, so the temperature should be controlled at 100 when heating? C - 140？ C, need to use heat to dry the moisture in the hair, in order to achieve the effect of reorganization.
The fourth difference is for different hair qualities.
Cold perm is a method of perming hair scales, which has a good effect on healthy hair. If the perm is damaged hair, the texture after perm will appear loose and broken.
Perm is a method to seal the hair scales. It is a perm technology specially made for damaged hair, which can supplement the nutrition inside the hair to the greatest extent and reduce the damage caused by perm.
The cold ironing operation is simple and easy to learn, and the heating method is convenient and fast, which is not limited by space and price. Scalding needs to master its performance, composition and application skills. Improper operation will cause hair to break or have no texture.
Detailed difference between cold perm and perm 1. The chemical process of cold perm and perm itself will cause a great loss of moisture and protein (especially moisture) in hair, and the hair lacking moisture will lack elasticity, toughness and tension. This is why cold perm hair needs moisturizing more to better show the curling effect. But perm is to change the internal and external structure of hair and make it last longer? Stereotype? . Therefore, perm curl can be well maintained in dry hair and wet hair.
2. A big difference between cold perm and hot perm lies in the operation procedure. Perm needs to curl the hair with a heated curling iron. This process can be used as a popular example: an iron bar may be deformed by external force, but the deformation effect is difficult. However, the physical shape of this iron bar can be changed to a greater extent by first heating (equivalent to softening hair and heating the winding rod) and then through the mold (equivalent to the shape of the winding rod). Different physical shapes will bring different shapes to hair. Different shapes of hair have different shapes in cross section. The cross section of straight hair is round, the curly hair is slightly flat and oval, and the curly hair is narrow and flat. That is, the difference between cold perm and hot perm is that hot perm can not only change the arrangement of disulfide strings in hair, but also change the physical form of hair more than cold perm. Every hair stylist also knows that the electric wand does not need any medicine, and only the heated electric wand can temporarily curl the hair, but the softened hair without medicine will soon recover its activity. Perm can do both, changing the cross-sectional shape of hair, which is why perm can better keep curly. Straightening itself should belong to the category of ironing, and its function is very similar to ironing.
3. The main components of the liquid medicine (softener and setting agent) used for cold perm and perm are basically the same, and the principles of these two perm methods are basically the same. They all combine disulfide (hydrogen bond and salt bond) in hair through softener. Cutting? Softening, and then recombining the cut disulfide bonds with sizing agent. Liquid medicine scalding often adds some anti-heat agents and hair nutritional supplements. Why do you need these drugs for a perm? It is because perm itself is harmful to hair, and perm is harmful to hair. Is it better? . However, the existence of these potions (such as antipyretics) does not affect the homology of cold perm and hot perm principles. This is why some people say that cold ironing liquid can also be used for ironing operation.
Precautions before and after perm Precautions 1: People who are allergic to perm.
1, allergic people should do scalp maintenance first, and massage their scalp with fingertips when washing their hair.
2. Allergic people should maintain or soothe their scalp before perm, so as to ensure that your scalp will not be damaged again.
3. Don't wash your hair too often before perm. You can wash your hair the day before oily scalp, and you can wash your hair two days before dry scalp. Use naturally secreted head oil to isolate and maintain your scalp.
Before perm, the hair will be cleaned in the hair salon. At this time, the scalp should be massaged with fingertips, and it should not be washed too clean, so that even if the liquid medicine accidentally enters the scalp, the scalp oil can also play an isolation role and protect the scalp health as much as possible.
Precautions for perm 2: Perm solution residence time
1, perm, don't let the liquid stay on your hair for more than 15-20min.
2, perm is not the longer you wait, the more you roll, and the potion used for perm has medicinal time.
3. The general action time of perming is between 15-20min, and the liquid medicine stays on the hair, so it is easy to calculate the hair quality.
Precautions for perm 3: In order to prevent allergic phenomena, you can try potions first.
1. To prevent allergic reaction to cold perm essence, rub a little on the inside of the arm before use, and then use it after proving that there is no adverse reaction.
2. Do not drip cold perm essence into eyes or wounds. If you are careless, you should wash it with clear water in time and then go to the hospital for treatment.
3. Barbers who are in frequent contact with cold perm essence must wear rubber gloves to protect their hands when perming, so as to avoid dermatitis caused by cold perm essence due to bad stimulation.
4. The main component of cold perm essence is ammonium thioacetate, which is slightly alkaline and harmful to hair. Therefore, perm should not be too frequent, usually once every 3 to 6 months.
Precautions for perm 4: Use professional after-care products after perm.
1, don't ignore the after-ironing care series launched by professional hairdressing brands. These products can not only repair damaged hair faster, but also help hair curl for a longer time.
2. If you don't buy post-perm care, plant care products are also a good choice. For example, ingredients such as wheat protein and almond oil can increase the softness of hair and make hair brighter.
Precautions for perm 5: logistics of perm in nursing.
1, perm is not once and for all, only with a curling iron, curling iron or a simple pinching gesture can you make your hair fluffy and airy.