The production of maple syrup begins by tapping a maple tree, setting free the tree’s flow of sap. Boiling the clear sap reduces its water content and brings out the rich sweet favor and dark color of the maple syrup. When packaging maple syrup, it should be stored in a glass, plastic or tin container. Glass is the preferred container, as it maintains the syrup’s flavor indefinitely. Syrup will store in tin for about a year, yet the container can rust. Syrup stored in plastic has a shorter shelf life -- between three to six months.
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Store any opened pure maple sugar in the refrigerator. Keep covered.
Keep the maple syrup for up to a year in its original container, if packaged in glass or tin. Keep for up to three months if packaged in plastic.
Discard the maple syrup if it has contains mold, even if it is a small amount on its surface.