Birchwood Casey Spanish Super Blue Liquid Gun Blue (part no. BC-13487) is a double-strength bluing solution built for bluing highly polished steel parts, including hardened steels containing nickel and chrome alloys. This version is packaged for the Spanish and broader European market in a 90-milliliter bottle, carrying the same double-strength formula found in Birchwood Casey’s domestic Super Blue line. It’s not intended for use on stainless steel, so it’s best matched to carbon steel and hardened alloy firearm parts with an existing blued finish. The extra strength over standard bluing solution makes it effective on surfaces that resist typical cold-blue chemistry due to hardness or polish. It’s a dependable option for gunsmiths and hobbyists working on tougher steel components that need more than a standard-strength bluing formula.

Key Specifications

• Formulated as a double-strength bluing solution for polished and hardened steel.
• Ships in a 90-milliliter bottle, packaged for the international market.
• Not intended for use on stainless steel.

Frequently Asked Questions

What steel types is this formula built for? It’s designed for highly polished steel and hardened nickel or chrome alloy parts, not stainless steel.

What size does it ship in? It ships in a 90-milliliter bottle.

Buy the Birchwood Casey Spanish Super Blue Liquid Gun Blue 90ml

Get the same double-strength bluing chemistry trusted worldwide, ready to tackle tougher, more polished steel surfaces. Order from Birchwood Casey‘s gunsmithing tools lineup and our Lubbock, Texas team will get it on its way to you.