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JAX Black Darkener - Recommended for Iron/Steel Parts


This chemical is subject to additional shipping charges when ordered with a kit. It can not go in the kit box. You will be invoiced for additional shipping charge, if it applies, after the order is placed. Cannot ship outside continental United States. Must ship surface transportation only.

The instructions below for Brass, Bronze and Copper are from the Jax website.  Jim has tested this product on the iron/steel parts of flintlocks and recommends it for this application. The usage instructions are the same.

Using JAX Black Darkener for Brass, Bronze and Copper is simple:

  • Prepare and clean the surface to be treated
  • Apply the JAX Black
  • Wash the JAX off the metal when the metal is slightly darker than your desired finish
  • Relieve with Scotch-Brite
  • Wash again with water and dry.

To ensure the best results, clean your metal of all lacquer, oil, grease and wax. JAX manufactures metal cleaners that are optimal for prepping your metal, but there is no one cleaner that will guarantee perfection. Your choice of cleaner depends on what you are trying to remove from your metal. Regardless of what you use to clean your metal, we recommend using Dawn Dishwashing Liquid as the final step before applying the JAX Black.

Wearing gloves is highly recommended as to not introduce oils from your hands to the metal. To be safe, eye protection is always recommended.

Use a bristle brush, sponge or rag and apply the JAX Black directly to the metal. You may also dip the entire object into the solution. However, do not leave the metal in the solution, or the solution on the metal, for longer than necessary. If the metal is clean, the JAX Black will work quickly. If left for too long the Black will rub off the metal easily. Practice and experience will help you find the right timing for your work.

If you are going to dip your metal into JAX Black, you may want to dilute the JAX with water; this will slow the reaction down and allow you to have more control over the finish (there is no magic dilution ratio – a little experimentation will allow you to arrive at the optimum ratio for your work).

If you are applying the JAX with a brush or sponge do NOT dilute the solution.

Once you have applied the JAX product to your satisfaction, rinse the metal well with fresh, clean water and dry.

At this point, you may use steel wool, a polishing cloth or Scotch-Brite to achieve your desired finish. If you remove too much of the blackened finish, you may reapply the JAX Black and start over.

If you seek to duplicate a particular finish, over-darken the metal and then “relieve” it with steel wool or a polishing cloth, as above. Once you are happy with your finish, you may wax, oil or lacquer the metal as a final step, although in many cases leaving the metal “unprotected” may be desirable.

JAX products never expire, however, they can deteriorate over time if not cared for properly. Safety is the first priority. Always store JAX products at room temperature, in tightly closed original containers AND in a locked, safe place. Do not mix used product with fresh. Contaminating the original container will seriously reduce the shelf-life of the product.

Always use JAX Products in plastic or glass containers. When you dispose of used products and containers, please do so in at an approved waste disposal facility. Never reuse an empty JAX container.

Make sure to refer to the Safety Data Sheets for additional information before you begin. Do not mix JAX Products with any other chemicals.


It is always advisable to test JAX Black in a small inconspicuous area to make sure that it does not adversely affect or damage the surface being treated.

 Jax Black - Safety Data Sheet


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JAX Black Darkener - Recommended for Iron/Steel Parts


Customer Reviews

Based on 17 reviews
Mark Jones
Worked as advertised

Easy to use and I’m pleased with the results. I used it on the barrel and like the color I ended up with. At this point I’m not sure how durable the finish is , but it would be simple enough to card it back and clean and redo it if needed. There is enough product in the bottle to do that multiple times if needed. Overall very satisfied.

Kenneth Harris

Jax Black is great for giving barrels and locks that aged look its a great product i give it 5 stars.

Bill Duvall


Jim Schaefer
Excellent for both brass and steel.

I've used JAX Black on both my Southern Mountain and Woodsrunner rifles. This included the barrels, locks and other metal parts. I found it gave both rifles a realistic vintage look that I really appreciate.

David Monroe
Jax Black (more dark grey than black)

This is an easy solution to apply but requires some steel wool work to even out the color. It's not quite a black, but still a pleasing color. I used it to color a lock in lieu of browning solution. My concern was controlling any thread corruption that is a risk with browning solution. Jax Black provided a good resolution to that issue and was easy to apply. It gave a quick reaction, but did require a few coats along with intermediate treatment with steel wool to get an even color. I am quite satisfied with the results that I acquired. I will continue to use it on small parts and lockplates. I am considering treating a barrel with it so I can maintain a common color on the rifle. I kinda favor browning barrels, but will try Jax Black on one in the near term.


Liquid Shipping

Liquids will not ship in the kit box. There are different regulations that apply to the chemicals that we sell and they will need to ship ground, when the kits will ship USPS Priority Mail. Plus, it would really stink if a liquid were to leak on your beautiful new kit!

Order tracking

You will receive tracking information when your item ships. For kits, you will be contacted before shipment and after shipment so there is no need to worry about a kit box shipping when you are out of town. All other packages will ship when available and you will be emailed a tracking link.

Get in touch

If you have questions, feel free to email us at or give us a call at 330-551-5844. Even if you have to leave a message, we promise to get back with you right away. Bree can answer most questions and she will be sure to ask Jim when needed.


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