The glass jar you purchased has not been sterilized, so when you use it to store pickles, a lot of bacteria will grow, which will cause the pickles to spoil, ferment, and become harmful to your health. In order to sterilize glass jars, the following steps can be followed: boil the glass jars in water for 5-10 minutes, which will kill the microorganisms inside the jars. Place the glass bottle in the oven for 30 minutes at about 150 degrees Celsius, this will eliminate the microorganisms inside the bottle. Use a high temperature and pressure sterilizer to sterilize the bottle, this will ensure that the bacteria are killed completely.