E-Prep 255 eliminates iridescent blue finishes on hard-to-blacken hardened micro-finished tool steel surfaces. Acts as a conditioner by enhancing the depth of black. Temperature: 75–150° F. Concentration: 5–10% by volume in water.
E-Prep 255 is a surface conditioner and activator used prior to room-temperature black oxide processes for steel.
Irritant
E-Prep 255 eliminates iridescent blue finishes on hard-to-blacken hardened micro-finished tool steel surfaces. Acts as a conditioner by enhancing the depth of black. Temperature: 75–150° F. Concentration: 5–10% by volume in water.