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There was a thread on TubaEuph some time ago on the subject. No reason for the mixture of lanolin and mineral oil, but it supposedly originated at Martin.

I kind of like it myself. Absolutely non-toxic--you could spread it on crackers and eat it without any permanent bad effects.

harold wrote:

permanent bad effects.

Note Chuck's disclaimer.

I like peanut butter better on crackers, but it smells sorta funny after a couple of months on tuba slides...