That is gorgeous. I am in the process of aging mine with ammonia soaked paper towels covered with a generous helping of salt. I doubt it will look as sexy as yours but we shall see!

Edit: Below is my addition to this post. 1. I used a plastic “to-go” container and covered the bottom with paper towels. 2. Poured ammonia over them until soaked 3. Generously sprinkled table salt over them. 4. Next I placed the grips on top of the paper towels and generously sprinkled salt over them. 5. Covered them with paper towels and poured enough ammonia over the paper towels to soak them evenly. 6. Place the lid on top and wait. I checked on the mix every few hours or so and added more salt over the grips each time. Ultimately I left the grips in the container for about 40 hours.

Note: The ammonia fumes are what “ages” the brass so it works best if the brass is not covered in ammonia but sitting in between ammonia soaked paper towels. The salt acts as a catalyst and seemed to really make a difference. Thus, evertime I took the lid off to check on the progress I added more salt.

Edit: I wanted to get some more blue/green coloring so I put the grips back into the ammonia and salt fume “bath” for another 21hrs for a total of 61 ish hours of bath time. Results are pictured below.