Design Blueprint: Lye Safety

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24121306): This study examines a practical question in everyday hygiene by explicit arithmetic from stated assumptions. The computed lye requirement for the recipe is 150.8 grams before any discount. Saponification uncertainty alone can raise the true requirement by 3.0 percent, and adverse weighing errors add a further 1.27 percent, giving a worst-case guarantee threshold of 4.27 percent superfat. The traditional 5 percent discount therefore meets the guarantee, with little to spare for this recipe and equipment. At half batch size the threshold rises to 6.17 percent, and with a scale accurate only to 5 Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.