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Black residue on tumbled jewellery


#1

I have black rubber tumbler which so far has not been depositing the
compound on jewellery yet but I have found that on occasions I have
inadvertently put some pieces in that are not silver i.e., copper or
steel, this then leaves a black residue on the other material.

The tumbler then has to be thoroughly cleaned before returning to be
tumbled again.

John Wallace


#2

My solution for black residue has been to use two sets of two white
tumblers. The first contains the Rio Grande clean cut plastic media
and I use deburring compound solution in those. The second set
contains stainless steel shot and I use Rio’s burnising compound for
those. When I use a patina or the silver is quite tarnished, I begin
with the first set of barrels and change the solution if it becomes
dark and black and continue in short units of time until clear. Then
I transfer the silver pieces to the stainless shot and tumble as
needed for polishing.

The burnishing compound is not a cleaning media. The deburring is a
cleaner. Perhaps the black grease stuff could be dealt with by a two
step process. It has solved my problem very well. I do have to clean
my steel shot with ammonia occasionally. I’m tempted to try Judy’s
Coke method as well.