I will continue to beat the dead horse.
First, that looks real nice. I like it a lot.
You can get a similar effect simply by rubbing in a couple or three coats of BLO. If you want it darker than the BLO will make it you can add a little of the walnut stain to the BLO. Then coat it with your finish when the BLO is thouroughly absorbed and dry.
And you won't take a chance on your harsh bases eating your nice brass furniture.
volatpluvia