You need to "pickle" brass in a solution of peroxide and water, I can't recall the ratio ATM though. Citric will only clean it, pickleing will remove any potential lead from the surface.
equipment: 50 litre keg boiler with a 2200watt element and a 2 inch pot still called Shaniqua with a 32mm over 19mm 800mm long liebig condenser attached.
How do you know that copper is lead free have scraped tons of copper pipe that had lead solder if that copper was reprocessed into pipe could have small amount of lead.
equipment: 2" pot with 2" shotty 400mm long 5x 1/2" on a t500 boiler. 50l keg boiler 4" still mount 4" sight glass 1" drain.. 4 plate 4" bubbler, 600mm packed section