Before the advent of electric light, candles and kerosene lamps were commonly used for lighting. Kerosene lamps produce strong black smoke and a pungent smell, and require frequent refilling of fuel. In addition to being inconvenient, they can also easily cause fires. In order to improve human life, Edison began to search for filament materials. In the process of inventing the electric light, he tested more than 1,600 materials and finally selected carbon filament with a melting point of over 3,500 degrees Celsius. In order to prevent the carbon filament from oxidizing, he removed the air from the glass bubble and used carbonized paper strips, carbonized cotton strips, etc. as filaments. However, these materials also failed because they were fragile and easy to break. Finally, Edison successfully invented the electric light on October 21, 1879, the carbon filament incandescent lamp, a lamp that uses electricity to heat fine filament wires to incandescence to emit light. The life of the lamp can reach more than 1,200 hours.

Behind Edison's success, he also experienced countless failures. The next year, Edison applied for an invention patent in the United States. He claimed: "We will make electric lights cheap, and only rich people will burn candles." The electric light he invented accelerated the industrial revolution at that time, and had a profound impact on future generations, changing the world. The whole world's pattern of life.

4 tips for painting
Although the oil painting process is simple and has the same color as children's oil, it is not so easy to apply oil evenly and smoothly. In fact, there are some techniques for painting, which even professional masters can use. Once you master them, you can easily paint the perfect wall and give your new home a brand new look!

1. From top to bottom, outside to inside
Pay attention to the sequence when oiling the wall. You should apply it from top to bottom to avoid oil dripping. If the ceiling is to be painted, the ceiling should be painted first, and then the walls on all sides to avoid staining the walls with paint that falls off when painting the ceiling.

In addition, brushes of different sizes should be used from the outside to the inside: first use a flat head to brush the four sides of the wall and the electric switch position, and then use a roller to cover a large area in the middle. This can be more efficient and achieve the same effect. More carefully.

2. "W-shaped" is more uniform
Regardless of whether you use a roller or a flat brush to apply oil, there will be more or less traces. Many professional masters will use the "W-shaped" technique for oiling. Use the brush head to draw the "W" back and forth on the wall from top to bottom until it is completely covered.

The "W-shaped" stroke method can minimize overlapping pen marks and reduce the formation of obvious marks. Moreover, the diagonal upward coloring can make the paint more even, and the result will be more detailed and even than brushing vertically back and forth.

3. The most important thing to smooth the wall is to “criticize the dust”
There is a layer of "ash" in the wall sandwiched between the cement and paint. It is usually made of clay, gypsum powder, vegetable glue, etc. If the gray layer floats and becomes loose, the surface paint will peel off. Moreover, if the wall itself is uneven, no matter how good the painting skills are, it will be difficult to paint the wall smooth, so criticizing the dust is an indispensable step before painting.

The steps for criticizing dust are as follows:

Step 1: First use a spatula to remove the floating and loose gray layer.
Step 2: Go to the hardware store to buy ready-made gray materials, or buy the materials and mix them yourself
Step 3: Fill the uneven parts of the wall with gray material, and then use a scraper to smooth it out
Step 4: After drying, smooth the interface with sandpaper
After applying the dust, it will be easier to lay the base of the wall, and the paint will be smoother and flawless. It saves a lot of processing and polishing steps, and can also make the paint more stable and longer-lasting!

4. Sanding should not be underestimated
Even if you are a professional master, there will definitely be one or two drip marks when painting, let alone a novice DIY.

But even if the paint is not smooth, don't worry too much. In fact, as long as the paint is dry, lightly sand it with the smallest sandpaper to remove the traces. If the wall is accidentally scratched, you can also add a layer of paint.

If you want to paint the wall smoother, before applying the second layer of paint, you can sand the wall with sandpaper to smooth out some of the paint mixed with dust, and then apply a new layer of oil. Although it takes more work, the finished product will be smoother. If you pursue perfection, you cannot save time.

Painting the walls in your home is one of those DIY projects that most homeowners can tackle, and it'll cost far less than hiring pros to do it. Plus, there are so many great paint brand options to choose from, giving your walls a refresh is easy. But you'll want to study up a bit before you take on this project. Using proper painting techniques—and the right painting tools—will give you a professional finish.

You'll see that our steps start with getting the wall ready. It may be tempting to skip ahead to the painting part, but prepping the wall appropriately is essential for getting professional-looking results. So gather your supplies...it's time to make your wall look brand new!

The price difference between latex paints of the same mainstream brand is as high as eight times. Is the difference big?

Cheaper paint, a little less functional. What is the paint function? Washing resistance, not easy to yellow, low formaldehyde, moisture-proof, etc., these are examples of paint functions.

Does that mean the more expensive the paint, the better the function? no. Some paints are more expensive because their raw materials are natural; but some mid-priced paints have better coverage. Since the formulas may conflict with each other, the functions cannot be superimposed at will, so the functions of different paints are different.

Here are some features of mid-priced paints.

1. Full-effect gold anti-mildew power
Gold full-effect paint, with the best overall balance and strong mildew resistance, suitable for users who are concerned about moisture and mildew on walls.

2. Lock color and save labor and materials
The Zhencai series with color-locking technology has super hiding power and is essential for dark oil paints, which can save more than double the labor and materials.

3. Children’s paint sells as anti-fouling agent
Many people think that children's paint is environmentally friendly paint. Of course, children's paint has the benefit of being environmentally friendly and low in formaldehyde, but children's paint has two other advantages, antibacterial and antifouling, which are very important for families with children.

The above different paints have different unique and powerful functions, and they are not even the slightest bit different! Everyone should carefully consider your needs before buying paint!