Abstract: Recently,some people used the Hogwash fat to make food.It will do a lot of harm to the people that eat the food.To look for the method that can distinguish the Hogwash fat from good edible vegetable oils and to prevent it from coming backto the edible oils market, we compare the Hogwash fat and frying oils with state standard.We also compare the concentration ofwater of the Hogwash fat ,frying oils and retail oils that buy from supermarket. We found that the acid value(AV)of the Hogwashfat and frying oils are much higher than the state standard.So the AV can be a characteristic that can distinguish the Hogwash fatand frying oils from good edible vegetable oils.

Key words: Hogwash fat, acid value(AV), peroxid value(POV), physical and chemical target