Caswell Mega Black Kit With Sealer

Chemically blackening metal with the Caswell Mega Black Kit

The Caswell Mega Black Kit from the USA is a complete set for cold chemical blackening of steel and iron and gives a very dark, even finish. Original product: Caswell Mega Black Kit

Features of the Mega Black Kit

• Complete package for steel and iron at room temperature, very dark final color.
• Suitable for hobbyists and small professionals, no special equipment required.
• Works on cold and hot rolled steel/iron, structural steel, alloy and tool steel, cast iron and forged steel. Not suitable for stainless steel.
• Sealer choice: Caswell Penetrating Sealer (oil) or Caswell Sealer (acrylic, water-based).
• Clear manual included.

Key features of Mega Black

• Starting mixing ratio: approx. 1:9 (10 percent concentrate in water).
• Process duration: usually 2–3 minutes to the desired black depth, maximum 5 minutes.
• Sealing: required for corrosion protection and color retention. Caswell Sealer can be diluted 1:1 with water for a thin, structureless layer.
• No noticeable size change, suitable for precision parts.

Contents of the Mega Black Kit

• Caswell Mega Black Concentrate
• Sealer of your choice:
  • Caswell Penetrating Sealer or Caswell Sealer
• Lockable bucket
• Gloves
• Distilled water
• Manual

Available in:

• 2 liter kit with 1 liter sealer
• 4 liter sealer with 2 liter sealer
• 8 liter kit with 4 liter sealer

Using the Mega Black Kit

1. Mix the concentrate with water according to the instructions.
2. Degrease and clean thoroughly. Avoid aggressive solvents on the workpiece; Use a suitable degreaser.
3. Dip for 2–3 minutes or work with brush/sponge until desired color is achieved.
4. Rinse in a designated container, not under the tap.
5. Immediately apply the chosen sealer while the surface is still wet and let it dry.

Frequently asked questions

• What is the difference with a standard black oxide kit? Mega Black usually gives an even darker final colour at similar process time.
• Is sealing mandatory? Yes, for steel/iron always seal for corrosion protection.
• Can I use this kit on stainless steel? No, use the Stainless Steel Chemical Black Kit for that.