Hatching in heraldry is a visual coding system that uses dots, strokes and line patterns to denote tinctures (colours, metals and stains) when full colour cannot be used - for example in woodcuts, engravings, seals or coins. Instead of colour, each tincture is identified by a specific arrangement of dots and lines (single-angle strokes, cross-hatching, dotted fields and combinations) so monochrome reproductions can convey the same blazon. Tricking, the older method of annotating tinctures with letters, serves the same purpose but is textual rather than graphic. Modern reference charts and Unicode mappings now record conventional hatch patterns and extensions for later tinctures such as orange, rose and bleu celeste.
The present-day system traces to Renaissance developments and was standardized in the 1630s by Silvester Petra Sancta and Marcus Vulson de la Colombière, though several earlier schemes (Jan Baptist Zangrius c.1600, Jacob Franquart 1623, Christophe Butkens 1626 and others) influenced the practice. Engravers played a key role in evolving practical hatch styles, and there has been historical dispute over priority and attribution. Multiple historical and regional variants exist, plus extended conventions for stains and additional modern tinctures; a few items (notably some hatchings for cindrée) remain inconsistently represented across sources.
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