While I was self-isolating at home, I cleaned out my larder and found several boxes of unsweetened chocolate. In both the use-by date is obscured, so I can’t tell how old it is. Is it safe to use this chocolate to bake brownies? --Susan W.
Yes, proceed with baking. Chocolate does not spoil, although eventually it may develop ‘bloom’ if not tightly wrapped and kept at room temperature. ‘Bloom,’ which gives the surface of the chocolate a whitish or grayish cast, is actually cocoa butter migrating to the surface when the storage temperature rises. It will disappear when the chocolate is melted.