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.

A surface conditioner and activator used prior to room-temperature black oxide processes for steel. 

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Irritant
Irritant
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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.

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