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Advances in Fingerprint Technology.pdf

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Silver Physical Development<br />

of Latent Pr<strong>in</strong>ts<br />

ANTONIO A. CANTU<br />

JAMES L. JOHNSON<br />

Contents<br />

7<br />

Introduction<br />

Background<br />

Carrier Solvents<br />

The Silver Physical Development Process<br />

Silver Physical Development <strong>in</strong> Photographic Chemistry<br />

The Photographic Developers<br />

Development Centers<br />

Fixation<br />

Comments<br />

The Silver Physical Development Process of Latent Pr<strong>in</strong>ts<br />

on Porous Surfaces<br />

Mechanism of Silver Physical Development<br />

Electrochemical Considerations<br />

Stability of a Silver Physical Developer<br />

Silver Image Formation<br />

A Hypothesis for the Silver Physical Development<br />

of Latent Pr<strong>in</strong>ts Residue<br />

Charge of Latent Pr<strong>in</strong>t Residue<br />

Formation of Nucleat<strong>in</strong>g Sites on Latent Pr<strong>in</strong>t Residue<br />

Formation of Silver Physical Developer Particles<br />

on Latent Pr<strong>in</strong>t Residue: Silver Image Formation<br />

Substrates<br />

Porous vs. Nonporous Surfaces<br />

Alkal<strong>in</strong>e Paper<br />

Preparation and Use of the Silver Physical Developer<br />

Preparation<br />

The Acid Pretreatment Reagent<br />

The Silver Physical Developer Reagent<br />

The Hypochlorite Post-Treatment Reagent

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