Blue Juice BJ2 is an oil for all valved instruments, piston and rotary. It was developed by a Chemical/Lubrication Engineer who is also a Trumpet player. The primary objective was to develop an oil giving fast valve action and staying power to minimise the need for re-lubrication. Less obvious Blue Juice has built in inhibitors to slow down bacterial growth, especially when it is a long time between clean-outs. Blue Juice is also non-corrosive to all metals used in the construction of musical instruments. In fact, it helps keep instruments internally clean; a problem all rotary valve musicians are very aware of.