What is the colour of unoxidized blood?

Unoxidized blood is red in color because it contains red blood cells that carry oxygen throughout the body. These red blood cells contain a molecule called hemoglobin, which has an iron center. When oxygen binds to hemoglobin, it gives the blood a bright red color. However, after delivering oxygen to tissues, the blood returns to the heart with a darker color as the hemoglobin loses some of its oxygen, mixing with other waste products. Therefore, unoxidized blood appears red due to the presence of oxygen-rich hemoglobin.