We frequently receive inquiries about stubborn, white, ring-shaped water stains (limescale) that have formed on the surfaces of copper teapot stands or tea trays. This is not metal corrosion, but rather the crystallization and adherence of mineral components like calcium and magnesium found in tap water as the droplets evaporate. Here, we explain how to prevent these marks and how to remove them to maintain a beautiful surface.
1. The mechanism of limescale formation
If spilled hot water is left to air-dry during a tea service without being wiped off, only the moisture evaporates, leaving the dissolved minerals to crystallize and bake onto the metal surface. When this process repeats, it forms a persistent white layer of scale.
2. The best prevention: "Thoroughly wipe dry" after use
When tea time is over, simply "wipe off all water droplets completely with a soft, dry cotton cloth." This 30-second habit is all it takes to prevent the formation of white limescale 100% of the time.
3. How to safely remove existing limescale
- Soften with warm water: Place a cloth dampened with warm water over the limescale for a few minutes to soften the mineral deposits.
- Gently rub with a soft cotton cloth: Do not use your fingernails; instead, gently wipe the area using the surface of the cloth.
- * Avoid strong acids or undiluted citric acid: While citric acid packs can dissolve stubborn limescale, they also risk stripping away the antique-finished oxidation layer applied by the artisan. Therefore, please refrain from using them on tea utensils with surface coloring.
For the differences between verdigris and limescale, as well as their safety, please refer to The Scientific Basis of Verdigris on Copper Tea Utensils.
