The Zt Zero Tolerance 0350BW Assisted Opening Knife G-10 DLC Blackwash Plain Edge. The 0350BW looks great in our Zero Tolerance's blackwashed finish. The 0350BW looks like it's been serving you for years—like a battle-tested tool or a favorite pair of well-worn jeans. Blackwashing gives it an already-broken-in look. To make a blackwashed knife, knife components are Tungsten DLC (Diamond-like Carbon) coated, then tumbled to produce the distinctive ZT blackwash finish.