if fat is present, a mixture of ethanol and water becomes __________ __________ in colour. what words complete the sentence?

The words that complete the sentence are: "milky white" or "cloudy." So the complete sentence is:
If fat is present, a mixture of ethanol and water becomes milky white (or cloudy) in colour. This happens because fat is insoluble in water and ethanol, so fat droplets disperse in the mixture forming an emulsion, which scatters light and gives the mixture a milky or cloudy appearance.