Looks very promising...I'm going to order a bottle and see how it works...
http://www.birchwoodcasey.com/news/4889.html
Let us know the results. I'm sure several of us here are interested in speeding up the aging of shiny brass.
I use plain old Cold Blue... it works great and leaves a nice, almost case hardened finsh if you work with it...
A lot of brass has a plastic coating on it so it has to be removed before the tarnish will take.
http://www.birchwoodcasey.com/news/4889.html
What appeals to me about the new Birchwood-Casey product...and this is based upon a discussion yesterday with someone at an antique metal finishing business who has used it...is that its already mixed, simple and quick to use...and it's not a coating which could rub off like 'Brass Black' does.
I found it can be ordered here...scroll about halfway down until you come to the Antique Brown M38.
It's available in 1/2 pint sizes, liquid or gel, for $14...I ordered a small bottle of each to try.
http://www.sculpt.com/catalog_98/patina/birchpatina1.htm