Library Classic is designed for institutions that measure time in centuries: deep umber (#3B2F2F) on parchment (#F7F3EA), with a leather-tan accent (#7A5C3E) in the frame. It belongs on bookplates, catalog cards, archive boxes, and reading-room signage — places where a stark black QR would feel like graffiti on a monument. Contrast around 11:1 keeps it firmly scannable while the palette speaks the visual language of paper, binding, and lamplight.
The square-on-square geometry is chosen for longevity, not nostalgia. Library codes have the longest service life of any QR application: a bookplate code may be expected to work for decades. Conservative geometry decodes on the widest range of present and future scanners, and the template's payload strategy is built around permanence — link to persistent identifiers (catalog record URLs, DOIs, archival reference numbers) rather than anything that will rot. Link rot is the real enemy of library QR codes: a code that outlives its destination is worse than no code, because it sits in thousands of books simultaneously. Use identifier schemes your institution controls, with redirect infrastructure maintained as core infrastructure, not a side project.
Archive boxes and rare-book applications add physical constraints. Codes on archival enclosures must use archival-safe, reversible labeling — no adhesives that damage enclosures, no inks that off-gas. A QR label on the outside of an archival box, linking to the finding aid, is the standard pattern; the code never touches the artifact. For circulating collections, bookplate codes face years of handling: Level M suffices for sheltered indoor life, but specify abrasion-resistant label stock, and keep codes clear of spine folds where modules distort.
Scanability notes: reading rooms are often dimly lit for preservation reasons — size codes at 25mm minimum so they scan in low light. Parchment-toned paper is fine (the template assumes it), but heavily textured handmade papers need a smooth printed panel. Test under the reading room's actual lighting, not office fluorescents. For catalog-record codes, the destination page must be the record itself, mobile-readable, with no login wall between the scan and the bibliographic data. Publish the redirect map where future staff will find it; institutional memory is the real infrastructure behind a decades-long deployment.
Best for: library catalog record links; bookplate codes; archive box finding-aid links; reading program and summer-reading codes; museum collection labels; publisher back-matter links.
Avoid for: adhesives or inks on archival artifacts themselves; linking to URLs outside institutional control; tiny spine labels; highly textured papers without a smooth panel; and destinations behind login walls.
Best for: - Library catalog record links - Bookplate codes in circulating collections - Archive box finding-aid links - Reading program and summer-reading codes - Museum collection labels - Publisher back-matter links
Avoid for: - Adhesives or inks applied to archival artifacts - URLs outside institutional control (link rot) - Tiny spine labels - Destinations behind login walls