Answer
For copper sink scratches, use 800, then 1000 and 1500. Use light pressure.
Why it happens
Copper is soft, so aggressive grit or pressure can create visible low spots and color differences.
Recommended grit
Use 800 for light scratches, then 1000 and 1500 before polishing or letting patina return.
Wet or dry
Dry or wet at finer stages.
Success check
The scratch is blended without a deep low spot.
What to do
- Clean the copper surface.
- Sand lightly with 800.
- Refine with 1000 and 1500.
- Polish or allow patina to even out naturally.
Avoid: Do not use coarse grit on visible copper sink surfaces.