I agree, the drop hanging from the starter, looks like coolant. The easiest way to know for sure, is to get a radiator pressure tester and test the system. You can rent one from Autozone. You have to buy it, but when you bring it back, they give you a full refund. Also the test must be done when the engine is cold. You don't want to open a hot radiator. It will be under pressure when it is hot, but not when it is cold. here is a video on testing the system.
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