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Re: Cleaning Tube Pins - we've found a simple solution

Nifty. An acid etch. I know that black crud you're talking about that seems to be unique to gold pinned tubes. It's interesting that the lemon juice acid loosens/softens this type of material. What is this stuff, anyway? Anybody know? What is the chemistry involved here?

I like idea of the light burnishing methods, too, with the hard polystyrene and carboard. It's good, I think, to go with the lowest impact method first, working to higher impact methods if necessary.

- SJ


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