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How to make iron turn black color without using black paint

i would like to buy some type of chemical that make iron/ steel to turn black color without using black paint. Please let me know where can I get it and what type of product can I get? Thanks so much.

Trang n
student - Sherman Oaks, California
February 1, 2010

Gun Bluing
birchwood-casey_bluing

on Amazon or eBay
(affil link)

Hi, Trang. Easiest is probably a laundry marker. But cold "gun bluing" is available in sporting goods stores.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
February 2, 2010

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