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Yes, free fatty acids can make your fatty ester product cloudy. Free fatty acids are polar molecules and can interact with water, leading to the formation of micelles. This can cause the product to appear cloudy or hazy. To prevent this, you can try removing any free fatty acids by washing the product with an aqueous solution. You can also try to use a base to neutralize the free fatty acids. This will help to ensure that your product is clear and free of any unwanted cloudiness.