5 12 15 .. Metal Finishing : Hot Black Oxide Finish on Brass : Chemical Conversion Coating

Black Nickel, Copper, Zinc Plating

Capabilities - CNC & Engineering - Great Lakes Metal Finishing

Birchwood Technologies Presto Black BST4 - Cold Brush on Blackener Solution for Iron and Steel alloys Traditional Patina Steel Blue and Black Oxide Touch-up (1 Quart)

Chemical Conversion Coating: Chromate, Phosphate, And Black Oxide - LEADRP - Rapid Prototyping And Manufacturing Service

Birchwood Technologies Presto Black BST4 - Cold Brush on Blackener Solution for Iron and Steel alloys Traditional Patina Steel Blue and Black Oxide Touch-up (1 Gallon)

What is Black Oxide Coating? Everything You Need to Know - PTR

Metal Finishing Guidebook

How to select the surface finish for screws

What is Alodine / Chem Film / Chromate Conversion Coating?

Black Oxide Coating: A Complete Guide to Precision Machined Finish