The best thing for ageing Brass is Livers of Sulphur it is used to age Silver and other metals in jewellery making, here in Britland you can purchase it via e-bay. Urine works well to but it takes much longer to produce the desired effect. The strangest of all was used by a good friend of mine to age the brass handles he uses in his Cabinet making business Pig slurry it works extremely well except for the smell.

The only lessons in my life I truly did learn from where the ones I paid for!