B/OX 312 Antiquing Chemicals for Copper, Brass & Bronze

B/Ox 312 is a process for copper, brass, and bronze is perfect for creating more pronounced brown to chocolate-brown tones and richer red tones when highlighted. Produces consistent color batch to batch.

It can be used at a 20% by volume solution that produces rich brown tones on copper and brass and a rich red tone when highlighted. Solutions that are diluted 5% to 10% by volume produce very light brown tones.

Subtotal $59.37
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Product Questions (3)

Customer Questions
What is black oxide?
Black oxide is a blend of caustic, oxidizers, and additives that is used on ferrous metals. There are three types of metal blackening: hot, mid, and room temperature blackening. EPi was the first company to offer all three processes. Hot black oxide (285 F°) is a conventional hot process which produces a true black oxide iron magnetite (Fe3O4) finish. It is a premium-grade salt mixture which will blacken a wider range of steel alloys than any other process on the market. Mid-temperature black oxide (225–245 F°) is the latest development in blackening processes, producing a true black oxide iron magnetite (Fe3O4) finish. It produces no caustic boiling fumes and provides a safer working environment. Room-temperature blackening (65–85° F) is the preferred metal-blackening process for safe and convenient in-house blackening. It is an excellent non-bleed black finish for powdered metal and cast iron. It produces super deep blackness and corrosion resistance equal to hot oxide blackeners. It is important to note this is not a true black oxide process; however, it may be referred to as room-temperature black oxide. Room-temperature blackening processes are autocatalytic reactions of a black selenium-copper compound that deposits on ferrous parts through an immersion process.
What makes EPI’s black oxide and metal-blackening processes better?
Insta-Blak processes do not produce smutty rub-offs like other room-temperature products. Our Ultra-Blak products are premium-grade black oxide, and Kool-Blak does not produce a smutty rub off like other mid-temperature processes. They are easy-to-use with wide windows of operation.
What are the advantages of black oxide and metal blackening?
  • Produces true black oxide finish Fe3O4 magnetite finish
  • Abrasion resistance
  • Corrosion protection
  • Meets military spec MIL-DTL-13924D and AMS 2485H
  • Blackens faster than other hot black oxides
  • Less sludge generation than other hot black oxides, which means lower gas bills
  • Capital costs less than $10,000–15,000 for turnkey operations
  • Energy savings
  • No CO2 emissions or green house gases
  • 1–5 minute process time for blackening
  • Powder metal does not bleed-out white salts like hot black oxide
  • Cast iron and steel castings do not turn red
  • No ventilation costs
  • Provides corrosion resistance
  • Dimensional stability thickness 5–10 millionths of an inch
  • Can be painted over
  • Anti-galling properties
  • Aesthetic appeal
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