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Title: From a Juilliard Trumpet Player and Personal Experience
Review: Blue juice is a very poor product that will corrode one's trumpet relatively soon after one begins to apply it as a valve or slide lubricant. I know this from personal experience as well as from the testimony of a Juilliard trumpet player. Additionally, it's overpriced, and it doesn't even work very well in decreasing friction. In conclusion, this product is very harmful for your trumpet, and its benefits are limited. You'd be better off using the basic petroleum-based valve oil provided by music stores with each instrument purchase, although synthetic oils are well worth the extra money, since they corrode metal at a MUCH slower rate than petroleum products and provide excellent overall lubrication.
