Why is bird s nest black? How to see the quality of bird s nest

The reason why bird's nest will be blackened is mainly considered to be that the bird's nest is not preserved in the process of preservation, which is caused by bacteria and microorganisms, otherwise the bird's nest will not be blackened under normal circumstances. Therefore, when preserving bird's nest in life, it is necessary to pay attention to sealing it well, so as not to let the bird's nest leak or be directly exposed to the air, which can easily lead to the blackening of the bird's nest.

Blackening is mildew, the reason is that the water content of the bird's nest is too high, it is stored for a long time, and the preservative is ineffective. Not recommended for consumption.

1. Different types of swallows make different shapes, colors and materials of bird's nests. There are mud, grass, feathers, etc.;

2. The only bird's nest that can be eaten is a bird's nest made of swiftlets. This bird's nest is mostly white and will be doped with some swiftlet feathers;

3. The black bird's nest may have a lot of feathers, or the bird's nest is moldy due to the dampness of the environment. If the bird's nest is not swiftlet's nest, it is black plant or mud;

4. Bird's nest is an edible bird's nest made of saliva endemic to Southeast Asia, and some feathers will inevitably be stained in the process of making a nest, so the newly picked bird's nest will have black feathers.

Bird's nest is black, blackened, mildew, bird's nest moisture content is too high, stored for a long time, preservatives are invalid, it is not recommended to eat, make sure that your bird's nest is not spoiled, the fresh is black, bamboo bird's nest is black, but the nutritional value is similar to bird's nest, edible bird's nest is not black, um.

When the bird's nest is making a nest, I bring in some small fish and shrimp, and the color of these small fish and shrimp is black, so I am also black when I beat it.

If your bird's nest has not deteriorated, what is fresh is black, then bamboo bird's nest is black. However, the nutritional value is similar to that of bird's nest. Actually, there is no black color in edible bird's nests.

Bird's nest has a variety of colors to divide your quality, so the black one should be one of the colors.

Are you sure you're talking about bird's nest? Bird's nests are divided into ordinary bird's nests and blood bird's nests, how can there be black ones? Have you eaten? Dye, anyway, I haven't eaten black bird's nest, can you introduce me where I can buy it?

1. Look at the certification documents for the import of bird's nest, there is an inspection certificate and a health certificate issued by the China Inspection and Quarantine Bureau, and the quality will be guaranteed.

2. Select. Look at the color and shape of the bird's nest, the color of a good white bird's nest is ivory white, and the particularly white one is likely to be bleached, as for the shape of the bird's nest, it is an untidy half-moon shape, the middle part is concave into a pocket shape, the texture is hard and brittle, translucent, the section has a mirror-like luster, and a slight angular texture is regarded as a good cup shape. And a good bird's nest cup has gaps, because in the process of artificial picking of bird's nest, there will be some gaps formed, and these gaps are originally swallow fine hairs or some other impurities, so it is normal to have gaps.

3. Smell the smell.

Good bird's nest has a faint egg white flavor, especially after cooking. Those with a sour, chemical, fishy or greasy smell are fakes.

4. Water content.

For bird's nests with high moisture content, bend the ends slightly by hand, and those with low moisture content are not easy to bend.

5. Soaking. There is a small amount of residual bird's nest after soaking, and it is impossible to completely pick the feathers completely by hand. After the bird's nest is soaked and soft, the silk strip is pulled, the elasticity is poor, and the one that breaks when pulled is a fake; Rubbing it with your fingers, it is also a fake if it can be kneaded into a paste without elasticity. After soaking in water, the real bird's nest has no oil stains or mucus, the shape is silky, the length and thickness are different or clumpy and irregular, the color is light milky yellow, not too white and translucent.

Look at the shape: Look at the shape of the bird's nest: The characteristics of high-quality bird's nest are that the shape is natural, the bird's nest silk is thick and dense, and the shape of the bird's nest is large and thick.

The neat and beautiful shape of bird's nest is made by artificial combination and pasting (such as using egg white, gelatin, starch and other substances as binders). Look at the lines of the bird's nest: the structure of the bird's nest should be a filamentous structure, and the lines are naturally untidy, while the lines of the bird's nest that have been artificially processed are arranged in a dense and neat manner.

And what is made up of a piece structure is not a real bird's nest.

Look at the color: Pure bird's nest, whether it is dried or soaked, is not completely transparent under the light source**, but appears translucent. The color of real bird's nest naturally presents natural ivory white, light beige and light earth yellow, and the color distribution is uneven, and the surface is relatively rough; Fake bird's nests are artificially bleached, the color is uniform and beautiful, and the surface is neat and smooth.

The color of the same bird's nest is different, there are different shades, and the color of the bird's nest is also different, while the color of the fake bird's nest tends to be the same after bleaching. House nests have good light transmittance, while fakes made of Malay gum or pig skin have low light transmittance, and pig skin is even completely opaque, but there is oil slick after it is launched. The color of cave swallows is dark yellow and naturally dark, with different colors around the edges, and gradually darkens from one side to the other.

Look at the thickness: Bird's nest is normally thin and natural, with uneven cracks, and the rubber-coated bird's nest is often thicker and no cracks, and the corners on both sides are flat and smooth. Fake bird's nests processed with Indonesian tapioca flour are heavier and whiter, with dense bird's nest silk and unnatural shape.

Smell: Real dried bird's nest will not have a strong smell, but will have the smell of "ammonia". Those with a special smell, fishy smell or greasy taste are fakes.

Only when it is fully soaked will the stewed bird's nest have the aroma of egg whites. Note that it may only be a protein scent, not some fruit, coconut, etcAnd so on. So the simple and effective way to identify bird's nest::

One sniff. There is an ammonia smell (also known as fishy smell and chemical smell) before soaking, and there is a fishy aroma of egg white after stewing. The taste will be strong and strong, but it must be there, and it will not be fake.

It should be noted that the smell of bird's nest bleached with hydrogen peroxide is seriously pungent, that is, the smell of disinfectant water in the hospital, which is completely different from the "ammonia smell". Malay glue has a sour taste. ）

Hand feel: Bird's nest should feel dry to the touch. Wetter bird's nests have more moisture and feel sticky to the touch, while bird's nests are softer to the touch and will become moldy if not stored properly.

Water soaking: Take a small piece of bird's nest and soak it in water, if the bird's nest is several times larger, it is a real bird's nest, but if it is not several times larger and gradually melts, and it is sticky, pressed or pulled without elasticity at all, it is a fake bird's nest. After the bubble is soft, take the silk strip and pull, the elasticity is poor, and it is a fake if it is broken when it is pulled, and it is a fake if you rub it with your fingers, and there is no elasticity to rub it into a paste.

The water soaked out is clear and not turbid, which is a real bird's nest.

Bird's nest is a bird's nest formed by the saliva secreted by swiftlets solidifying in the air. Natural house nests are ivory-white, off-white or yellowish, and are called white nests or official nests.

The white color of normal white bird's nest is uneven, and the white color of transparent gum is uneven. If the bird's nest looks pale and the whole bird's nest is very similar in color, it may have been bleached with a chemical solution. The color distribution of natural bird's nests is uneven, some places are dark and some places are light, this is because swallows eat different insects every day, and the color of the liquid secreted is naturally different.

Therefore, if the bird's nest itself is unnaturally white, and it is difficult to see the fine hairs in the bird's nest, it may have been bleached.

Therefore, when choosing, it is necessary to know that Yuheng chooses bird's nests with layered colors, not black, but white.

This is the cave bird's nest, which is a nest built by swiftlets that grow in caves in the Malay Archipelago. The natural minerals on the rock wall penetrate into the white bird's nest and oxidize to form a rust-like golden bird's nest. Growing in the origin of bird's nest, the above bird's nest is a hole bird's nest after dehairing and cleaning from the naked eye, and it is not artificially colored.

Bird's nests are divided into white bird's nest, yellow bird's nest, and blood bird's nest according to color. This is related to the origin of the bird's nest, the season and the nesting environment. In terms of origin, bird's nests from Java and Sumatra in Indonesia are yellowish, while those from Kalimantan and Sulawesi are white.

In terms of season, bird's nests are white in rainy seasons and yellow in dry seasons. Blood bird's nest is mostly cave bird's nest, because the bird's nest is built on a rock wall, and the bird's nest is often stained with iron-rich water. It is normal for bird's nests to be yellow and white, and most of them are white.

Pure blood swallows are scarce and the most precious Qingmeng, followed by yellow swallows, and then white swallows. The pure white swallow is off-white, and the land zone of Baili Cave is yellow.

Friends who often buy bird's nest should know that the color of bird's nest after soaking is directly related to the variety of bird's nest, but no matter what variety of bird's nest is cooked, it should be natural color and will not become other colors.

Why does bird's nest turn black after stewing.

The color of the cooked bird's nest turns black, which is most likely caused by the bird's nest being stewed with other ingredients or the bird's nest quality is not up to standard.

In the process of humidification and other treatments, bird's nest operators are not up to standard, which can easily lead to the problem of why the color of boiled bird's nest turns black.

And why the color of the boiled bird's nest turns black, there are two main reasons:

1.Bird's nest is simmered with other ingredients.

Bird's nest has high nutritional value, and improper stewing process can easily cause the loss of nutrients in bird's nest, and the color of boiled bird's nest turning black is one of the situations that affect consumption.

2.Inferior bird's nest.

Knowing what kind of bird's nest is good is the premise of eating good bird's nest, if it is inferior bird's nest, it is added chemical ingredients during processing, so it causes the color of the cooked bird's nest to turn black.

Can you still eat the boiled bird's nest when it turns black?

Judging by the status of the bird's nest, fake bird's nest is not recommended to be eaten.

When the color of the boiled bird's nest turns black, it is necessary to determine whether it can be eaten according to the state of the bird's nest.

If the bird's nest is discolored due to the same cooking with other ingredients, it can be continued to be eaten, but be careful to simmer the same ingredients separately when simmering the same ingredients in the future.

If you exclude the situation of stewing with other ingredients, that is, the quality of bird's nest is not up to standard, so don't continue to eat it at this time, as bird's nest will produce harmful substances after spoilage, which will have adverse effects on the body.

The color of the bird's nest after it has been stewed.

Generally speaking, boiled white bird's nests are translucent in color, while yellow bird's nests will be translucent or yellowish depending on the bird's nest, and blood bird's nests will be red or orange.

No matter which variety of bird's nest it is, the color of the cooked bird's nest should be natural, and the bright color is very likely to be a problem with the bird's nest.

Different types of bird's nests have different colors, and generally white bird's nests are mostly translucent.

What is best to stew bird's nest with.

Bird's nest is flat, rich in sugar, organic acids, proteins, free amino acids, sialic acid and other ingredients, with the effect of nourishing yin and moisturizing dryness, nourishing and nourishing qi, beauty and beauty, etc., it is best to stew and eat with ginseng, rock sugar, papaya, milk, white fungus and other sweet and nourishing foods, which not only tastes better, but also is more nutritious and has a stronger nourishing effect.

1. If you want to identify the authenticity of bird's nest, you can observe the structure of bird's nest to judge. Generally speaking, the structure of a good bird's nest is filamentous, and if the structure of the bird's nest is made of sheet structure, it belongs to the fake bird's nest. In addition, pure bird's nests are mostly translucent when soaked or under light**.

2. Smell by smelling the smell of bird's nest can identify the authenticity of the bird's nest. **The bird's nest has a characteristic fragrance, and the smell is not very strong, and there is a unique smell of sea and sawdust, as long as you carefully distinguish the authenticity of the bird's nest.

3. If you want to identify the authenticity of bird's nest, you can take a small piece of bird's nest and soak it in water. After it is soft, take the wire strip and pull, if the elasticity is poor, it means that it is a fake. In addition, if you find that the bird's nest is not elastic and can be kneaded into a paste after rubbing it by hand, it also means that the bird's nest is a fake and inferior product.

4. The water quality of soaked bird's nest will be relatively clear after soaking in water, while the fake and inferior bird's nest will appear turbid after being dissolved in water due to the presence of other ingredients.

Identification There are three types of bird's nests: cave nests collected from nature, house nests raised in captivity and built indoors, and processed nests. In addition, there are artificial bird's nests made from seaweed and fake bird's nests made with starch, etc. This kind of counterfeit can almost be fake, so to identify bird's nest, we must first distinguish the real from the fake, and then divide the category and set the grade.

The secret of buying beautiful bird's nest: First, the origin should be fixed: there are as many as 28 types of bird's nest, if you want to buy bird's nest every time you belong to the same kind, you must clearly know that it is all bird's nest picked from the same origin (for example:

Sumatra, Indonesia), only in this way can the bird's nest be processed at the same cooking time and taste the same taste. Bird's Nest Gift Box The second is to look at the hair of the bird's nest: different types of bird's nest also have different "hair heads" ("hair heads" are the difference between the weight of the bird's nest and the dry body after it is soaked, the larger the multiple, that is, the better the "hair head", the more it is eaten), and the general official swallow has 6 8 times the "hair head".

Third, it depends on whether the bird's nest is clean: the less fine hairs, the better. Fourth, pick the lamp type:

The thinner the head and feet at both ends of the bird's nest, the more beautiful it is. Fifth, it depends on whether the bird's nest is dry and light: those with dry and less water are the top quality.

High-quality bird's nest should feel dry to the touch. Wetter bird's nests contain more moisture and can become moldy if not stored properly. Key points for non-laboratory identification of bird's nests:

1.Look: Bird's nest should be a filamentous structure, and it is not a real bird's nest composed of a piece structure; Pure bird's nest is not completely transparent, but translucent, whether it is soaked or under light**.

2.Smell: Bird's nest has a unique fragrance, but no strong smell.

Those with a special smell, fishy smell or greasy taste are fakes. 3.Touch: Take a small piece of bird's nest and soak it in water, take the silk strip and pull it after it is soft, the elasticity is poor, and the one that will break is a fake; Rubbing it with your fingers, it is also a fake if it can be kneaded into a paste without elasticity.

4.Burning: Use fire to ignite the dried bird's nest slices, if it is a real bird's nest, it will never produce any violent splashing sparks.