Okay here is test one.
The Instruction say wipe on-wipe off.
Shake bottle well. Apply a small amount of Kramer's to a cotton or linen cloth and wipe onto surface to be treated. Moisten the surface with enough Kramer's to feed the surface and allow it to take in what can be absorbed.
My cloth turn black!
Instruction then say wipe dry with clean cloth.
Here's before.
Here's after.
The orginal metal finish is clearly visable. Spot of rust not touched. Wood stock starting to show original finish.
It does not appear the original patina has been touched.
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you have to get a feel for it. 
weren't you?