On Jan 16, 2021, at 08:16, - <rrrr6789@gmail.com> wrote:

 FWIW, My father was a licensed commercial ammunition reloader and he used
ground walnut shells to clean fired brass (in a cement tumbler!). Sand was
too sharp and abrasive and would scratch the brass badly but walnut hulls
gave a brilliant polished finish. He bought ground walnut hulls in large
bags that weighed about 50 pound each and like those that seed and grain
used to come in.

On Sat, Jan 16, 2021 at 10:17 AM Roy Thistle <roy.thistle@mail.utoronto.ca>
wrote:

On Fri, Jan 15, 2021 at 11:28 PM, ditter2 wrote:


sandblasting scopes with crushed with crushed walnut shells

There are different "media" used in "sandblasting booths:" glass beads,
silicon carbide, steel shot, aluminum oxide... and walnut shells.
Media usually come in grades... from fine to coarse. You can get walnut
shells in 8/12, 30/100 and so on.
Walnut shells are called "soft shot"... but, you can still strip top coat
paint with them.
The walnut shells are usually black walnut... of which the U.S. has a
great preponderance: black walnut grows wild... and the nut is very hard to
crack... so there are lots of them that never get hulled... and can be
processed into grit.
Usually the media/shells are mostly blown away inside the booth... for
reuse... after it impacts on the item being cleaned. (There is a lot of
circulating air, in most booths.)