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Causes of Dark Marks on the Bottom of Cookware and Care Recommendations

Sometimes, after use or washing (especially in a dishwasher), dark or gray marks may appear on the outside bottom of the cookware.

This is not a defect in the material or coating, but the result of natural chemical and physical processes during use.

Why this happens

1. Metal transfer marks (minor abrasions)

During dishwasher use, cookware may come into contact with:
  • other pots and pans
  • cutlery
  • metal rack components
This can cause microscopic transfer of metal particles (most often steel), leaving dark marks on the surface.

2. Mineral deposits (hard water)

Water with high levels of:
  • calcium
  • magnesium
can leave limescale deposits that:
  • accumulate in the tiny surface texture of the bottom
  • appear as gray or dark spots

3. Effect of detergents

Some dishwasher tablets or gels contain:
  • alkaline components
  • salts
At high temperatures, these can:
  • increase mineral buildup
  • react with metal particles

4. Temperature effects

During heating and cooling:
  • the metal surface expands and contracts
  • microparticles can settle into the surface

Cleaning recommendations

Light residue

  • Use a soft sponge and regular dishwashing liquid

Moderate residue

  • Use baking soda or a mild cleaning agent
  • Gently clean using the soft side of a sponge
  • Rinse with warm water

Stubborn marks

Use specialized cleaners for:
  • stainless steel
  • limescale removal
  • Apply for 1–2 minutes
  • Gently wipe and rinse thoroughly

Important

  • Do not use metal scouring pads or harsh abrasives
  • Avoid aggressive chemicals. Do not use alkaline or highly alkaline cleaners
  • It is recommended to dry cookware thoroughly after washing
  • Place cookware in the dishwasher so it doesn’t touch other items as much
  • Discoloration of the aluminum base may occur when washed in a dishwasher
  • Dishwasher safe at low temperatures (max. 50°C / 122°F)

Conclusion

These marks are a natural result of normal use and do not affect:
  • product performance
  • safety
  • durability
  • With proper care, the original appearance can be easily restored.