2, black, spray paint this, children should not teach, so as not to be harmful to physical development.

3. Wear black sunglasses. I think this method is good. The problem is that there seems to be no ancients.

4. Time-related big brother black pottery belongs to pottery and is not glazed. Even if it is made to shine, it will burn incense for thousands of years. If it doesn't shine, you still have a problem.

5. Black pottery can be divided into polishing and calendering. Polishing refers to wiping pottery with a soft blanket, and calendering refers to polishing pottery with hard pebbles.

The former is dark and the latter is bright.

Black pottery has been shiny since ancient times, just as books and paintings turn white paper into yellow paper over time, so black pottery will gradually lose its luster.