The vine motifs on these tanto are applied through surface engraving, which cuts or etches the design into the blade flat rather than painting or printing over it. On manganese steel blades, the engraving channels appear darker against the surrounding metal because they catch less polish and allow slight oxidation to develop in the recesses — giving the vine pattern natural contrast without any added coloring. On stainless steel examples, the engraved lines reflect light differently from the polished surface, creating a subtler but still visible botanical pattern. Neither type uses paint or lacquer fill, so the engraving remains durable over the life of the display piece.