wiki-Aike

Definition: Small cracks or thread-like holes that appear at the junction where different steels—such as soft iron and hard steel—are joined in a knife.
Details: Most commonly found in awase knives (laminated construction), Aike occurs when adhesion between steels is imperfect or hammering during forging is insufficient. It may resemble tiny worm-like lines or pinholes on the blade surface.
Comparison: In modern quality control, Aike is often regarded as a flaw that reduces visual perfection. However, in traditional craftsmanship, some consider it a natural trace of hand-forging and thus a marker of authenticity, especially when function is not compromised.
Practical Use: Aike generally does not affect cutting performance or durability, but buyers should be aware of it as an aesthetic factor. Professional chefs may overlook minor Aike in favor of blade performance, while collectors may see it as undesirable or, conversely, as proof of hand-forged origin.

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