Scrapbooking is a freewheeling craft, but there is one rule: If you're displaying original photos or documents, select papers and adhesives that are acid-free or, better yet, archival. Translucent interleaving will offer additional protection to photos over time. Consider using high-quality photocopies while keeping your original photos, documents, and other valued items in a light-safe, acid-free box.
When affixing photographs, avoid placing an adhesive in the center, as it can warp the surface and create craters. Try an invisible vellum tape, which adheres very well and barely shows behind sheer paper. If you do any writing, use a pigment ink rather than a dye ink, as it lasts far longer.
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For basic techniques and tools, these articles should get you started on your way: