Which innovative packaging feature was first widely adopted by publishers of religious texts in the early 20th century to signify reverence and protect sacred content?

Religious products packaging serves both practical and symbolic purposes across faiths. From protecting sacred texts to conveying theological meaning through design elements, packaging decisions impact how believers interact with devotional items. This trivia explores a fascinating aspect of religious product packaging that highlights the intersection of commerce, tradition, and spiritual significance.

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Gold-edged pages on premium bibles and holy texts
Biodegradable covers made from plant-based materials
QR codes linking to online theological commentaries
Heat-sensitive ink revealing hidden scriptural passages