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With ferric salts its solution gives a deep blue colour, and with ferrous salts, after exposure to the air, an insoluble, blue-black, ferroso-ferric gallate.
All four main catechins present in green tea were shown to have a dose-dependent vasodilating effect, with epigallocatechin gallate being the most potent.
Chemicals such as BHA, propyl gallate and ethoxyquin have been found to cause illness and allergies in a number of pets.
Green tea contains caffeine as well as a chemical called epigallocatechin gallate, or EGCG.