As almond oil begins to deteriorate, noticeable changes in its characteristics may occur. It might become cloudy, thicker, or develop a gritty texture. Alterations in color, such as turning yellow or brown, could also be apparent. When sampling the almond oil, if you detect a bitter or sour taste, it's a strong indication that it has gone bad. In contrast, unspoiled almond oil should possess a mild, slightly sweet flavor.