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When lining a baking tin, it's generally better to use parchment paper with the non-shiny side facing up. Parchment paper is designed for direct contact with food and provides a non-stick surface, which is ideal for baking. Aluminum foil, on the other hand, should be dull side up to prevent food from sticking, but it's not recommended for direct contact with food as it can tear or create an uneven surface. If using foil, ensure it's food-safe and handle with care to avoid punctures.
