1. Black endothermic

Have you noticed such a phenomenon: In the hot summer sun, if you wear dark or black clothes, you will feel hotter, while wearing light-colored or white clothes will feel relatively less hot.

Conversely, in the warm sun in winter, wearing dark or black clothes will make the surface of the clothes warmer, while light-colored clothes will be relatively less warm.

Yes, this is a common sense of life. Dark-colored objects can absorb more energy from light and convert it into heat, while light-colored objects can only absorb a small amount of energy and convert much less heat.

Simply:

Black (dark) absorbs more light and generates more heat

White (light color) absorbs less light and generates less heat

This is the principle of selective heat absorption, which has many wide applications. The laser hair removal we are going to talk about today is the principle used.

2. Selective heat absorption

People on the earth have different skin colors and very different hair colors.

Is laser hair removal suitable for everyone? 

Let's first look at the principle of laser hair removal:

The high-energy light beam enters the skin, and the dark hair follicles and hair tissues in the skin absorb more light, generate more heat, and cause damage, thereby reducing hair growth. The light-colored cell tissues in the skin can only absorb a small amount of light and generate a small amount of heat, which is not enough to produce a destructive effect.

In other words, for laser hair removal to work, it must meet such conditions

Hair follicle hair part-darker color

Other parts of the skin-lighter in color

In other cases, the effect of laser hair removal is not very good, such as light-colored skin and light hair color; or very dark skin color and dark hair color.

So, when you want to do laser hair removal, first check whether you are suitable for it. If the hair color is dark and the skin color is light, it is more suitable.

3. Laser hair removal

There are actually two kinds of light used for hair removal

1) Laser

2) Strong light

However, we generally use a laser to collectively refer to it. We don't have to deliberately remember the difference between laser and strong light. In fact, the effects of these two types of hair removal are similar, and the specific differences are reflected in some details such as light parameters.

There are 2 important parameters, it is necessary to be familiar with it, it is very important for us to choose a hair removal device

1) Light outlet

Relatively speaking, the laser light exit area is small, which means that laser hair removal takes longer for the same area of skin.

The IPL has a relatively large light outlet area, which is suitable for large-area hair removal and for people who lack patience. To

2) Wavelength

Low-energy short-wavelength intense light (IPL) can be absorbed by the retinal pigment at the back of the eyeball. When the temperature rises, it may cause permanent eye damage. From the perspective of eye safety, strong light (IPL) should be >550nm.

4. Effect

The home hair removal device is effective, the effect  temporarily delay and reduce some hair growth

It will cause some damage to the hair follicles, allowing the hair to enter the resting phase from the growth phase, and the reduction of the hair can be visually felt. But it is not long-term hair removal. After too long of use, the hair will gradually grow back.

In the hospital, there are professional laser hair removal equipment, the effect is better, yes

Long-term hair removal

Most hair follicles will be destroyed. After six months to one year of treatment, most hairs will not grow again after a few years. But it will not reach the level of permanent extinction.

5. Choose

Okay, let's make a summary of the household laser hair removal equipment:

1) Who is suitable for?

People with light skin color and dark hair have better hair removal effects.

People with dark skin have a higher probability of skin damage.

People with light hair color basically have no effect

2) Orange lights and red lights are safer

The wavelength of household lasers is 810nm, which belongs to the red light range

The home light is orange light and the red light

3) The hair removal effect is inferior to hospital professional equipment

The home hair removal device can temporarily delay and reduce hair growth, but it can only damage the hair follicles. After stopping, the hair will slowly grow back. The professional hair removal equipment in hospitals can remove hair for a long time.

4) Side effects

Just one of the objects that the skin needs to defend against, the light of the home hair removal device will have an unknown effect on the skin, and the visible side effect is that the skin may become red and may have a tingling sensation. Invisible side effects may cause damage to normal cells. so, stop when you feel uncomfortable.
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