What product did the indicator of the fat digestion detect?

The indicator of fat digestion typically detects the presence of fatty acids and glycerol, which are the products of fat breakdown. During digestion, lipases break down triglycerides into these components, allowing for their absorption in the intestine. Common indicators used in experiments include phenolphthalein or pH indicators that change color in response to the release of fatty acids, indicating a change in pH as fats are digested.