From our archives…
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How to achieve fine matt finishes on precious metal surfaces
by: Wilfried Schafer
A micro-waterjet device can be used to achieve fine matt finishes on
precious metal surfaces. Parts required for this are: jet or wet lap
hammer, slow-running compressor, vacuum apparatus, and pressure
sprayer…
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https://www.ganoksin.com/borisat/nenam/fine-sandblasting-texture.htm