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• Original walnuts are light brown or golden in colour. But fake ones are dark brown or black.
• The dull kernelled walnut is the one which is fake and should be avoided. The glow of an original walnut's kernel is distinct and therefore easily differentiated from a fake one.
• Walnut kernels, or shelled walnuts, can go bad in three months, whereas whole unshelled walnuts have a shelf life of up to a year when properly stored, and will likely still contain high levels of nutrients.