INK DYNAMICS
The Physics of Forgery Detection
A signature is not an image. It is a recording of speed, pressure, and muscle memory. To a forensic authenticator, a forgery screams. It stutters. It hesitates.
When you buy a raw autographed card on eBay, you are often buying a "slow drawing" of a signature, not the signature itself. Here is the science of how we tell them apart.
The "Shaky Hand"
Real signatures are fast. They rely on "ballistic movement" (muscle memory). The pen flies across the paper.
A forger is drawing, not writing. They have to look at a reference image. This split-second cognitive load causes the hand to pause.
- ✖ Ink Pooling: When the pen stops, ink bleeds into paper fibers.
- ✖ Tremors: Micro-shakes visible at 20x magnification.
The Autopen Problem
Robots (Autopens) apply perfectly even pressure from start to finish. Humans do not. A human presses harder on downstrokes and lighter on upstrokes.
*Note: VSC (Video Spectral Comparators) can see these pressure ridges even on thick card stock.
Facsimile vs. Real
The most dangerous fake is the "Facsimile" - a printed copy of a signature. To the naked eye, it looks perfect.
The Test: Hold the card at a 45-degree angle under a high-lumen light source.
Sits on top of the gloss. Reflects light differently than the card surface. Has texture.
Is flat with the surface. Reflects light exactly the same as the surrounding card. Zero texture.
Don't Buy Without DNA.
Our directory lists the only authentication companies (PSA, JSA, BAS) that use these forensic methods.
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