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# HardcoreScience

2026-11-04

Time-Traveler's Guide: Tired of Dark Paper Windows? Here Is How to Fire River Sand and Plant Ash into Crystal-Clear Flat Glass and Mirrors

【Time-Traveler's Hardcore Tech Guide · #08】In pre-industrial centuries, winter meant choosing between freezing winds or sitting in pitch-black rooms behind oiled paper windows, while royalty peered into blurry bronze mirrors. Grounded in silicate glass chemistry and citing Song Yingxing's 'Tiangong Kaiwu' and 16th-century Venetian Murano recipes, this guide shows how to combine white quartz sand, soda ash, limestone, and pyrolusite (MnO2 'glassmaker's soap') at 1150°C to craft clear flat window glass and silvered mirrors.

2026-11-03

Time-Traveler's Guide: Ancient Builders Boiled Tons of Rice for Mortar—Here Is How to Fire River Clay and Limestone into Modern Hydraulic Cement

【Time-Traveler's Hardcore Tech Guide · #07】In ancient China, building city walls and aqueducts required boiling thousands of pounds of precious glutinous rice into lime mortar—starving granaries while still failing to cure underwater. Grounded in silicate chemistry and citing Song Yingxing's 'Tiangong Kaiwu' and Vitruvius's 'De Architectura,' this guide shows how to combine limestone, river clay, iron scale, and gypsum at 1420°C to produce genuine Portland cement that cures rock-hard underwater.