Instead of guessing, you can always send a sample of the coolant out for analysis. Here is an example of one lab that offers this service: https://polarislabs.com/coolant-testing-and-analysis/
I don't have any experience with them- a search will show a number of testing lab options.
I have had oil analyzed in the past. Big trucks with huge sumps change their oil based upon testing results to get the most values out of an oil change, but the results can zero in on head gasket leaks and bearing failures by metals showing up in the oil. A coolant test will tell you exactly what is happening. In my opinion a color change in ANY engine is not a good sign.
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