Blue Juice 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 obviously, Blue Juice has built-in inhibitors to retard 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.