Now it's freezing outside, and only eating meat can fill my hunger brought by the cold, so during this time, the hot pot has not been less shabu, and as soon as I come and go, I find that the dishes on some stores are a little "weird" -
Don't dare to lower your mouth .jpg
Image source network
But the fat beef rolls we usually eat are red and white.
This is what fat cow rolls are "as they are"
This is really confusing: is this yellow fat beef slice not new? More importantly, can it be eaten?
Why is beef fat white and yellow?
First of all, the conclusion: it can be eaten! It is also normal for beef fat to appear yellow, and it has little to do with whether the meat is new or not fresh.
If you think about it, many animals have only one fat color, such as chicken fat is yellow, sheep fat is white. Why is the fat of cattle yellow and white?
Chicken fat (left) is yellow and mutton fat (right) is white
Image source network
The color of animal fat depends mainly on the content of pigments in fat, especially carotene, which are mainly derived from the food they eat. Herbivores and omnivores can usually convert carotene into vitamin A and store it in the liver, but the transformation ability of different animals is very different, such as humans and chickens, which are weaker in this regard...
As we all know, carotene is a fat-soluble pigment and insoluble in water, so those carotenes that cannot be converted into vitamin A are stored in body fat, and over time, the fat turns yellow.
It is precisely because humans have a weak ability to convert carotene, so most of the body fat extracted during liposuction is yellow. Image source network
Now back to our protagonist cattle, from the feed they feed, cattle can be divided into two categories: grass-fed cattle and grain-fed cattle. The carotene content in fresh pasture is much higher than that of grain feed, so grass-fed beef tends to be more yellow than grain-fed beef. In addition, due to perennial pigment accumulation, mature cattle (old cattle) tend to have a darker fat color than calves.
In slaughterhouses, grass-fed beef has significantly higher fat than grain-fed beef. Image source: agproud.com
But obviously sheep and cattle are grazing on the pasture, why is the mutton fat as white as jade? This is because sheep convert carotene into vitamin A much more efficiently than cattle, so there is less carotene in body fat and a whiter color.
Lamb rolls
Cooked lamb, green enough to make you panic
While you're unlikely to eat fat, yellowed lamb rolls, you're likely to eat... Lamb glowing with a "weird green light".
Ah, the picture is misplaced, it's the one below.
Is this really not moldy?
Image source: ifun01.com
Not just lamb, but also pork, beef or other cooked meat cross-sections may have a green fluorescence, or even a rainbow metallic sheen. Looking at this piece of green flesh, I have to suspect that there are always Diao people who want to harm!
Many types of meat exhibit this iridescent fluorescence, with green being the most common. Image source: ifun01.com
The appearance of green or iridescent color in meat is actually an optical physical phenomenon, called the raster effect, which can also be simply understood as an iridescent effect that occurs in the cross-section of meat.
Typical examples of the iridescent effect are the wings of butterflies and the feathers of birds. We often see butterfly wings often show a variety of metallic luster under light, and the color will change under different viewing angles.
The shimmering butterfly looks blue, but in fact there is no blue pigment in its wing scales, and blue is the light reflected by the scales. Image source: wiki
Take the Ann's hummingbird out of town again!
Image source: wired.com
These brilliant metallic colors are mainly due to the unique and complex microstructure of butterfly wings. If you look at it with a microscope, you will find that the butterfly wings are covered with countless tiny scales (that is, the powder on the wings), and the surface of these scales has fine structures such as grooves and ridges, and when the light shines on it, different refractions, interference and diffraction occur, just as the light passes through the prism and is divided into different colors of light. The same goes for the birds' captivating and changing colorful feathers.
Microstructure of butterfly wings (top) and principle of light coloration (bottom)
Image credit: Haider Butt et al
Why does meat also produce iridescent? Generally speaking, it is inseparable from the knife method of cutting meat, and meat cut along the texture is generally not prone to iridescent effect, but meat cut against the texture, especially cooked meat, may have an iridescent effect.
If you cut against the texture, the muscle fibers will be cut off, and a lot of regularly arranged, concave and convex microstructures will be formed on the cross-section, just like butterfly wings, light will also diffract on these undulating tiny structures, and at a specific angle, the texture of the flesh will split into multiple colors like a rainbow. After boiling and marinating beef, the muscle fiber cut surface is more regular and the iridescent color is more obvious.
The microstructure of individual muscle fibers in beef cut surface and their details
Image source network
Usually from another angle, the iridescent on the meat will disappear, which means that these meats can be eaten with confidence. However, if no matter how you change the angle, these colors will not change or disappear, then it is better not to eat.
This one can be eaten
"Fish of the planet Pandora", can earthlings eat it?
Green light meat slices are nothing, we can be a little greener, have you seen green fish bones?
This emerald green bone, beauty is beautiful, but just for this color, who dares to try this fish rashly. Image source: Twitter@Alistair
This kind of "skeletal" fish is a jaw needlefish, but it is really edible fish! It once appeared in "China on the Tip of the Tongue" under the name of wolffish, which made the fishing captain a bowl of delicious wolffish instant noodles.
Jawed needlefish has different names in various places, some places are called needlefish, needlefish, and some places are called needlefish (good) fish, wolffish or blue flag, each claim it. Image source network
Its bones are naturally green, and environmental pollution has little to do with excessive heavy metals. Fish of the jaw needlefish family have much higher biliverphyll content in the body than other fish, so the bones appear a distinct green, which is also the main feature of the jaw needlefish family, which does not affect the consumption.
Without the weird color of P, the jawed needlefish is very suitable for disguising as alien biological specimens. Image source: Twitter@sagoshistar
However, compared to the following fish from the "Pandora planet", the jawed needlefish is still playing a big knife in front of Guan Gong.
Look at the turquoise fish steak, dare to take a bite?
Image source network
Good fellow, that's how the Na'vi's blue skin is eaten, right? （bushi）
Excuse me
Image source: The movie "Avatar Water Way"
Although it looks like fish imported from aliens, earthlings can eat it with confidence. This fish is snake cod (a common name for some monolinear fish) and is found mainly in the waters off the west coast of North America. In fact, most snake cod meat is white and clean, and there is only a 20% probability of encountering "Pandora Limited Edition".
Blue flesh snake cod and white flesh snake hake can be identified with the naked eye
Image credit: TimesColonist
Although the cause of the blue meat snake hake is still unclear, a considerable number of theories believe that this is the scourge of biliverdin, and some believe that it is caused by the different eating habits of fish.
Blue meat snake cod is also edible, and some people even think that blue meat is more delicious than white meat, and the most amazing thing is that its fish meat loses its beautiful blue-green color after the cooking process, and becomes a serious white fish after cooking.
The fish meat that can "turn magic" is served without knowing that its predecessor is "Avatar". Image source: facebook@WOLF in the FOG
It's not a family that doesn't enter the door, the close relatives of snake hake, the long-line six-threaded fish that belong to the six-threaded fish family, and there are also the same type of avatar, which can be eaten and benefit foodies.
Long-line six-threaded fish "Pandora Limited Edition"
Image source: sdsukelp.weebly.com
Moreover, it is said that these "Pandora Limited Edition" fish meat tends to sell better than the Earth version. If you come across these "weird" foods later, don't be afraid and let go of the guts to eat!
Help, the sushi in the fridge actually glows!!
Lamb rolls fall apart as soon as they are cooked? You're afraid you've eaten fake lamb
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Written by | Crayons are not new
Part of the picture | Figureworm Creative
WeChat Editor | Ah what cool