Is the Iridescent Beef Truly Dangerous?

When enjoying a hearty bowl of beef pho, you may have noticed a shimmering, iridescent green hue on the sliced beef. This unexpected rainbow-like color might spark concerns about spoiled meat. So, what's the truth behind this curious phenomenon?

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Ordering a bowl of phở chín (cooked beef pho), you may notice a peculiar green sheen on the sliced beef. Some assume that this is a sign of old meat or chemical treatment, but this is not the case.


A piece of beef with a rainbow sheen. (Source: Sohu)

According to experts from the United States Department of Agriculture (USDA), the iridescent effect is commonly observed on cooked beef cuts and is not an indication of chemical treatment or expired meat. In reality, this phenomenon occurs due to the presence of iron and fat in the beef. When the meat is cooked and sliced thinly, the light refraction creates a rainbow-like iridescent sheen.

Additionally, beef is composed of layers of muscle fibers. When sliced thinly, we cut across these muscle fibers, creating a smooth, flat surface. The combination of light and heat then results in the observed color change.

This phenomenon can also occur in other types of meat, such as pork and bacon.

Hence, the iridescent rainbow effect on beef does not indicate any compromise in food quality.


A piece of beef with a rainbow sheen. (Source: Sohu)

However, you should avoid beef that exhibits the following:

– Wet or lacking elasticity: If the surface of the meat is wet or lacks elasticity when pressed, it has likely been left out for too long or thawed and refrozen, indicating it is not fresh.

– Dark or gray color: This suggests that the meat is no longer fresh or is in the process of spoilage due to oxidation. It may taste unpleasant and even cause stomach aches. Opt for beef with a characteristic red color, a sign of freshness.

– Unusual odor: Fresh beef should not have a putrid or unpleasant smell.

– Thick, yellow or brown fat: Fresh beef will have a thin layer of light yellow fat. If the fat appears thick and dark, it indicates old meat.

– Coarse, short, and light pink fibers: Some sellers mix pork with beef to deceive customers. If you notice coarse, light pink fibers, you may be buying pork disguised as beef. Instead, look for meat with fine, long, and dark pink fibers.

Source: vtcnews.

Frequently asked questions

Iridescent beef refers to meat that exhibits a rainbow-like sheen on its surface. This unusual appearance has sparked worries among consumers who associate it with spoilage or the use of harmful chemicals.

Yes, iridescent beef is safe to eat. The unique sheen is a natural occurrence caused by a thin layer of harmless fat on the surface of the meat. This fat layer creates a prism-like effect, reflecting light and resulting in the iridescent appearance.

Despite assurances from experts, some consumers remain skeptical due to the meat’s uncommon appearance. It’s important to understand that this phenomenon is purely aesthetic and does not indicate any issues with the quality or safety of the beef.

Absolutely! A great example is ‘blooming’ in chocolate. Chocolate sometimes develops a whitish coating, which might be mistaken for mold. However, this bloom is merely a result of temperature changes affecting the cocoa butter and does not impact the chocolate’s edibility.

Education and awareness are key. Providing clear and accurate information to consumers about the natural occurrence of iridescence in beef can help dispel myths and misconceptions. Additionally, transparent communication from meat producers and retailers can build trust and reassure customers about the safety and quality of their products.
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