2026-11-05
Time-Traveler's Guide: How to Distill 98% Concentrated Sulfuric Acid ('Mother of Industry') from Pharmacy Green Vitriol in a Clay Retort
Time-Travel Core Tech Reconstruction Guide #09. Without sulfuric acid (H₂SO₄), a time traveler cannot make nitric acid, hydrochloric acid, superphosphate fertilizer, lead-acid batteries, or smokeless powder. We break down the thermal decomposition thermodynamics of iron(II) sulfate heptahydrate (FeSO₄·7H₂O), cite Song Yingxing's 1637 Tiangong Kaiwu on 'Green Vitriol (Qingfan)', and provide a step-by-step 650°C glazed stoneware retort distillation guide.
