What are the hard, white deposits in my canned tomatoes?
These white deposits are calcium nitrate. It is safe to eat. The calcium nitrate precipitates out of the tomato as a result of mashing or pureeing. The deposits vary with the growing season and geographic region. It is usually found on the surface of the tomato product or attached to the lid or side of the jar. Simply remove with a clean spoon. If it is throughout the jar of product, it is safe to eat but the texture may be undesirable. It is hard and will not disintegrate when rolled between the fingers.
