Канал: 拋光師Hans

Coin polishing - what is the effect of polishing a 5 cent coin to 80,000 mesh?

Coin polishing - what is the effect of polishing a 5 cent coin to 80,000 mesh?

It took 40 hours to grind a stone picked up by the river to 20,000 mesh. What will happen?

It took 40 hours to grind a stone picked up by the river to 20,000 mesh. What will happen?

Spent 60 hours making a hand-held mirror out of tin foil, polished and polished until shiny

Spent 60 hours making a hand-held mirror out of tin foil, polished and polished until shiny

Ancient Chinese bronze mirror polished and refurbished。

Ancient Chinese bronze mirror polished and refurbished。