What chemical reaction would cause a peach cobbler to turn the biscuit topping green within a few hours?

The green color in a peach cobbler's biscuit topping could result from a chemical reaction involving baking soda, especially if it contains a significant amount of aluminum. When baking soda reacts with acidic components in the peaches or other ingredients, it can sometimes produce a greenish hue due to the formation of certain copper or iron complexes. Additionally, if the cobbler is exposed to high levels of moisture or certain metals, it may also lead to discoloration. Proper ingredient balance and storage can help prevent this reaction.