Forensic Analysis Tools
A suite of browser-based utilities to evaluate signatures against known metrics. All image processing happens locally on your device; no data is uploaded.
Slant Evaluator
Measure baseline divergence and ascender angles to check against a signer's known natural slant.
Autopen Overlay
Superimpose two signatures and adjust opacity to check for the exact mechanical match of an autopen matrix.
Inflation & Premium Adjuster
Calculate true hammer prices by stripping variable auction house premiums and adjusting historical sales for inflation.
Secretarial Probability
Input signer, date range, and document type to calculate the likelihood the item was signed by staff.
Nib Width Analyzer
Estimate the fountain pen nib width (EF, F, M, B) used in an exemplar based on stroke diameter.
UV Degradation Calculator
Estimate ink fading timelines based on ink type, glass UV protection, and average lumen exposure.
Ink Timeline Reference
Check when specific ink formulations (Iron Gall, Ballpoint, Sharpie) were introduced to identify anachronistic forgeries.
Optical Brightener Check
Guide for using blacklight to detect modern paper (post-1950s) masquerading as vintage material.
Hesitation Detector
Examine magnified stroke images for telltale signs of forgery: stops, starts, and "drawn" rather than "written" lines.
True Cost Calculator
Calculate final cost across major auction houses including sliding-scale buyer's premiums and estimated taxes.