The purpose of blood grooves, also known as fullers, on a sword is a topic of debate among experts. While their exact function is not definitively established, there are several proposed theories:

1. Weight Reduction: One theory suggests that blood grooves were primarily used to reduce the weight of the sword without compromising its structural integrity. By removing material through the creation of a groove, the overall weight of the blade could be reduced, making it more manageable and easier to wield.
2. Structural Reinforcement: Another theory proposes that blood grooves enhance the structural strength and flexibility of the blade. The groove redistributes the stress along the blade, allowing for greater resilience and reducing the likelihood of the sword breaking or bending under impact.
3. Sound and Vibrations: Some believe that blood grooves alter the acoustics and vibrations of the blade when it strikes an object. The groove may help to disrupt or dissipate vibrations along the blade, reducing the reverberation and potential discomfort felt by the wielder.
4. Symbolic or Aesthetic Purposes: In some cases, blood grooves are purely decorative or serve a symbolic purpose. They can be present for aesthetic reasons, providing a visually pleasing pattern along the blade or adding to the overall design of the sword.

It's important to note that historical records and accounts on the specific function of blood grooves are limited, and their effectiveness may vary depending on the design and construction of the sword. The true purpose of blood grooves may differ from sword to sword or be a combination of factors. Regardless of their precise function, blood grooves h