How long can you keep tomato paste in the fridge?

According to the folks at Contadina...Tomato products can be kept in the refrigerator for 2 to 3 days. Remove the balance of the product from the opened can and place it in a container equal in size to the amount of product. Seal tightly. This reduces the amount of air in contact with the tomato product. Air causes oxidation and the product will turn black. But a little olive oil will also keep the air out.