To clarify factors indispensable to the geening reaction of “Gobo”, authors tried an experiment by a “Tempura” model system. Alkalinity of solution in “Koromo”, chlorogenic acid or its related compounds contained in “Tane”, and nitrogeneous compounds in “Tane” and “Koromo”, were indispensable factors to the greening reaction. The reaction proceeded even at above 100°C.
