a. It impairs the value of the property.
For example: Kennedy sells a picture to Jose.
Upon delivery Jose finds that the picture has some stains on it.
This is a defect for which the seller must be liable.
b. It impairs the fitness for ordinary purposes.
For example: Kennedy buys a horse from Jose for the purpose of making a movie.
Upon delivery Kennedy finds that the hair of the said horse is burnt and it becomes an ugly horse.