2. Green tea can be used to make tea eggs, but more black tea is used. Tea eggs cooked with green tea leaves taste slightly bitter, and green tea is cold, which is not suitable for people with stomach problems, infirmities and pregnant women. However, black tea leaves are fermented and baked, and tea polyphenols undergo enzymatic oxidation under the action of oxidase, so the content is reduced, so the irritation to the stomach is also reduced. Black tea is rich and mellow, without bitterness, and its color is bright. The boiled tea eggs are full of fragrance, uniform in color and excellent in appearance, so black tea is generally used to cook tea eggs.