Epitalon by quarter
Coverage and results for Epitalon quarter by quarter. Read the supplier-count column beside the median: a quarter where the compound mix changed is not comparable with the one before it, and the index cannot hold that constant retrospectively.
| Quarter | Batches | Reports | Median purity % | IQR pp | Suppliers | Flagged | What changed in the index |
|---|---|---|---|---|---|---|---|
| 2024-Q1 | 0 | 0 | — | — | 0 | 0 | Backfill quarter. Reports assayed earlier were accepted retrospectively where custody could be documented. |
| 2024-Q2 | 0 | 0 | — | — | 0 | 0 | First quarter of live submission. |
| 2024-Q3 | 1 | 2 | 99.93, 99.70 | — | 1 | 0 | Nordanalyt Laboratories began contributing. |
| 2024-Q4 | 0 | 0 | — | — | 0 | 0 | Impurity-fingerprint matching introduced; first shared-bulk links published. |
| 2025-Q1 | 1 | 1 | 99.50 | — | 1 | 0 | Anomaly rule set expanded from seven rules to eleven. |
| 2025-Q2 | 1 | 2 | 99.93, 99.93 | — | 1 | 0 | Gravimetric mass-balance reconciliation became mandatory on new records. |
| 2025-Q3 | 0 | 0 | — | — | 0 | 0 | Kestrel Bioanalytical began contributing; gradient-length normalisation introduced. |
| 2025-Q4 | 2 | 2 | 98.77, 99.56 | — | 2 | 1 | Provenance classification became a required field. |
| 2026-Q1 | 3 | 19 | 98.44 | 0.55 | 2 | 6 | Rule AX-R12 added. Dataset v2 schema published. |
| 2026-Q2 | 3 | 11 | 98.39 | 1.36 | 3 | 9 | Buyer-sourced sensitivity analysis added to every supplier scorecard. |
| 2026-Q3 | 0 | 0 | — | — | 0 | 0 | Quarter in progress. Aggregates for this quarter are provisional. |
Median purity by quarter
Quarters with fewer than two purity records are gaps in the line rather than zeroes. A trend across 11 points, most of them thin, is a shape and not a finding.