does molasses expire
1 Yes! 2  Youâll likely notice thereâs no expiry date on bottles of molasses but it can go moldy, ferment or crystallize when it gets old. 3  Its shelf life is usually a good 18 months so you have plenty of time to use it up before it expires. When sugar is refined from sugarcane, there is a thick syrup that remains from the process. 2  Molasses is this syrup and depending on what part of the refining process it comes from determines the grade and whether itâs light, dark or blackstrap.