One. Are black spots on ceramic cups normal?
Ceramic cups with black spots are caused by impurities in the ceramic raw material, specifically iron, that have not been properly processed. During firing, the iron on the surface oxidizes to form iron oxide, resulting in the "black spots".
Two. Can ceramic cups with black spots still be used?
Generally, black spots on the inner walls of ceramic cups do not affect their usability. If you are concerned about these spots, you can use some methods to clean them off.
Three. How to remove black spots inside ceramic cups.
1、Utilize fruit peels for cleaning.
Using the peels of oranges, tangerines, and lemons can easily remove dark spots. Simply place the cup and the peels in water and boil. After boiling a few times, the cup will be clean. Alternatively, you can use apple peels to scrub salt onto the ceramic cup and gently remove the dark spots. You can also clean the dark spots on the ceramic cup.
2. Use toothpaste for quick cleaning.
First, thoroughly rinse the container inside and out with water. Then, apply a small amount of toothpaste to the container and scrub. After a while, rinse clean with water.
3、Scrub with salt
Dark spots on ceramic cups can be cleaned with salt. Dip your finger in a small amount of salt and then rub it on the dark spots on the ceramic cup. The abrasive action of the salt will effectively remove the stains.