Big Mac lovers beware, your burgers are indestructible and possibly indigestible.

McDonald's converts may be left reeling after disturbing new footage shows boiling hot molten copper being poured over a Big Mac, resulting in the ‘buns of steel’ burger remaining relatively intact.

After heating up the copper to boiling point, the experimenter — wearing protective gloves— begins slowly pouring the liquid over the bun and then the attempted ‘mac attack’ begins.

View photos The moment the 'liquid gold' was poured over the burger. Source: YouTube. More

As the liquid hits the bun, large flames erupt immediately. However, within a few seconds, the bun appears to ‘put out the flames’ leading to the suggestion that the bun and its various ingredients have flame retardant properties.

During the three-minute video, the food chain’s signature dish withstands a temperature of around 1085°C being poured over its entire surface.

Popular YouTube user Tito4e uploaded the clip and has proved that 'murdering this burger' is virtually impossible.

View photos The burger first burst into flames but then the buns appeared to act as a 'flame-retardant. Source: YouTube. More

Tito4e has developed a cult following for his for his niche uploads, which result in experiments of pouring molten copper on everything from steak, coconuts and even a pair of Nike Air Jordans with varying results.

The caption for the video that has been uploaded to YouTube and viewed more than a million times said: “Pouring molten scrap copper on Big Mac. Copper's melting point is 1085°C".

Surprisingly, the bun only begins to char after a minute of being exposed to the boiling liquid. However, the remainder of the ingredients inside appear to be ‘untouched’.

View photos The burger that just wouldn't burn. Source: YouTube. More

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