Rare steak slices on a metal skewer
What Makes Steak Juices Red, If Not Blood?

NEWS

By ELIAS NASH
a piece of steak with red in it
While a freshly grilled steak may appear "bloody," the juices you see are mostly water. It's red because the water mixes with a special protein called myoglobin.
steak with a puddle of "blood" on the plate
Myoglobin is found in mammalian muscles, where it stores oxygen. Blood contains a protein called hemoglobin, which binds to oxygen and carries it throughout the body.
steak with cut pieces with red coloring
When blood reaches organs and muscles, the oxygen transfers from hemoglobin to myoglobin. They perform the same function but store oxygen in different places.
a red slice of steak
They also share another thing in common: the color red. This is because they contain iron, which turns red when exposed to oxygen in the air.
three pieces of steak on a kitchen tool
The more myoglobin in meat, the redder it will appear. That's why meat from cows, who have high levels of myoglobin, is dark red.