Generally speaking, only in the prime of life, Jin Cansiyan has flat lights, and most swallows make triangular lights and round lights with the help of corners. Flat lamps are produced in Jin Siyan in the prime of life, so their nutritional value is higher than triangle lamps and round lamps. This is also the reason why the price of flat lamps is higher than that of triangular lamps and circular lamps in the market (not only because of selling photos). The following figure is the physical diagram of three kinds of lamps in turn.
Triangle light:
Round lamp:
Flat lamp:
In this way, according to popular science maps and illustrations, everyone should have a concept of judging the cup shape of bird's nest.
A. According to the classification of grams of origin, the standards from small to large are as follows:
Fenugreek (3-4.5g) < . Round lamp (3-4.5g) < . Small lamp (3-4.5g) < <; /span>。 Medium cup (4.5-5.5g) < < /span>。 Headlights (5.6-6.5g) < < /span>。 Headlights (6.6-8.5g)
Among them, the big and oversized ones are generally made by Jin Siyan, who is 4-6 years old, while the triangular and round ones are generally made by swallows, who are 2-3 years old.
B the size of lamps can also be based on another standard, which is also the selection standard of Tong Ren Tang.
Those 2.7-3.3cm tall are small, those 3.3-3.8cm tall are medium, and those above 3.8cm tall are large and oversized.
Extended data:
Identification of bird's nest
There are three kinds of bird's nest: cave swallow collected from nature, domestic swallow artificially raised indoors and processed bird's nest. In addition, there are artificial bird's nest made of seaweed and fake bird's nest made of starch. This kind of fake can almost be confused with the real one, so to identify bird's nest, we must first distinguish between true and false, and then classify and grade it.
Shopping tips
First, the place of origin should be determined: the place where Jin Siyan grows affects the quality of bird's nest production. The more impurities such as dust in the place of origin, the darker the color of bird's nest produced by serious air pollution, the higher the rain and forest coverage area in the place of origin, the better the wool and the higher the quality of bird's nest produced. Many famous bird's nest brands in China come from the above-mentioned producing areas.
The second is to look at the hair of bird's nest: bird's nest picked in different periods also has different "hair heads"
Third, it depends on whether the bird's nest is clean: the less fine hair, the better.
The fourth type is picking: the thinner the head and feet at both ends of bird's nest, the better it looks.
Fifth, it depends on whether the bird's nest is dry and intellectually fit: dry and low in water content is the top grade. A good bird's nest should be dry to the touch. Wet bird's nest contains more water, and it will be moldy if it is stored improperly.
Six stews: stewed bird's nest, of course. Good bird's nest is resistant to stewing, and the bird's nest with pure hand-picked hair is not easy to look watery. After stewing, there will be a strong protein fragrance, which is an important indicator of true and false bird's nest. Fake bird's nest won't have this fragrant protein flavor. The chemically treated bird's nest is easy to turn into water if it is stewed for too long.
The difference in the quality of bird's nest lies in six indicators: trimming degree, origin, raw material, completeness, cleanliness and taste.
Bleached bird's nest
Soak the bleached bird's nest in water and take it out. After about half a minute, rub it with your thumb and forefinger a few times. Fingers will stick to the smell of chemicals, and bleached bird's nest will not rise much after stewing, which is easy to water and has no natural egg white smell.
Bleach all or part of other dark brown or mixed black bird's nest to make the surface of bird's nest look brighter and thicker. Identification method: soak the bird's nest in water and take it out. After about half a minute, rub the bird's nest with your thumb and forefinger several times. If the finger smells of chemicals, it is bleached bird's nest. After stewing, the swelling rate is not large, it is easy to water, and there is no natural egg white flavor.
References:
Baidu encyclopedia-bird's nest