エッチング仕上げ

エッチング工程は、まず包丁を徹底的に洗浄し、油分や残留物を取り除くことから始まります。エッチングしない部分には保護マスクが施される場合があります。その後、刃体を塩化第二鉄などの酸性溶液に浸すと、鋼の層ごとに異なる速度で化学反応が起こります。これにより刃の表面に暗色の酸化皮膜が形成され、鋼の反応性に応じて皮膜の厚みが変化します。エッチング後は重曹溶液で中和処理を行い、すすいで乾燥させます。最後の工程では刃を研磨してエッチング模様を際立たせ、包丁の美しさを高めるとともに、作り手の技術を引き立てます。

An etched finish is created by masking parts of the blade and exposing the unmasked steel to a controlled acid bath (typically ferric chloride for knife steels). The acid removes material at a uniform rate, leaving a slightly recessed, matte pattern where exposed. On clad blades, etching also reveals the contrast between core and cladding steels.

Etched finishes are most commonly used to highlight damascus patterns by bringing out contrast between the layered steels. Less commonly, etching is used decoratively on monosteel blades to add brand marks, logos, or pattern designs.

Wash by hand with mild detergent. Avoid alkaline cleaners and prolonged acid contact (citrus, vinegar) which can deepen or alter the etched contrast over years of use. The pattern is etched INTO the steel, not painted on — it will not chip or peel, but heavy polishing or aggressive sharpening near the etched zone can fade the contrast.