Dry lentils will keep almost indefinitely stored in a tightly covered container in a cool, dry place. If exposed to light, pulses tend to lose their colour but flavour, nutrition and texture will not be affected as long as they are tightly sealed. However, the longer lentils are stored, the drier they become. This means they may take longer to cook and may remain slightly chewy after cooking. It is best to use dry lentils within one year of purchase.