Edible Ink and Edible Paper (Frosting Sheets) come labeled with best by dates, which are typically a few months to 1-2 years, depending on batch and what's in stock at a given time. The best by date is essentially a quality indicator and different to an “Expiry date”. Generally speaking, food that is used past the “Best by” date may lose freshness, taste, or nutrients. Since edible ink is a food coloring that contributes little to no nutritional value to the overall product, using the edible ink (or edible paper, which also has little to no nutritional value) slightly beyond the best by date is still safe. It is advisable to keep the edible ink sealed in its original packaging until needed, and to replace any cartridges within 6 months of use.