Blueprint: No-Electronics Witness Label for Sealed Grain Stores — Manufacturing and Use Specification

DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. Manufacturing-and-use specification for the passive two-channel witness label designed in the source paper: William Alexander Aldred, 'A No-Electronics Witness Label for Sealed Grain Stores: Integrating Moisture Exposure and Seal Failure on One Passive Card', DOI: 10.5281/zenodo.24109114. The blueprint specifies the 60 mm by 30 mm card carrying a latched humidity-indicating salt strip and a throttled oxygen-sensitive dye spot: dimensions and layers, bill of materials with quantities (unit cost US $0.057 per store at a production volume of 100,000 labels), print and finishing specification, placement and reading protocol, and the full response specification — red in 0.76 days on a failed seal, red in 0.66 days on grain sealed wet, green through 90 days in an intact hermetic store — with tolerances, failure modes, storage and handling, and manufacturing quality checks. The label is honest only between 15 °C and 35 °C. Every performance figure is computed from the source paper's model, not measured; nothing described has been built. The accompanying compute.py reproduces the source model from its stated parameters (all 25 checks against the source paper's deposited values pass) and derives the blueprint's additional build quantities, recorded in results.json.