Antifreeze is a sweet-tasting substance that prevents engine coolants from freezing in cold weather.  It's made up of ethylene glycol or propylene glycol, which are both colorless and odorless liquids. The sweetness of antifreeze comes from these chemicals, which are also used in food flavoring and sweeteners.  While the taste of antifreeze may be pleasing to some, it can be dangerous if ingested.  Actually, a tiny amount of antifreeze can cause kidney damage or failure, so keep it out of the reach of children and pets. If you guess your child or pet has eaten antifreeze, seek medical attention immediately.