Why do my silver necklaces always turn bronze coloured, and how do I prevent this?

After sometimes, every silver jewellery turns into black or bronze color because of a chemical reaction between silver and air or other carious substances. You can use any of the following method to prevent the jewellery:
- Wash you jewellery with warm water and then, dry them with a soft cloth.
- Polish you jewellery regularly to protect it from turnishing.
- Protect your jewellery with the substances like water, etc. & hence, remove the jewellery while washing up or taking a bath.
- Remove jewellery while cooking
- Pusse & seal them in a plastic ziplock bag when you store them
But, if your jewellery already turns into bronze color then follow use the given trick
- Put tarnished jewelry in a bowl of warm water, salt and baking soda