Peter T. Daniels wrote:

>

> There are conventions in heraldry for representing the 7 tinctures
> (colors) when arms are depicted in monochrome (different hatchings).

Colors:
Red (Gules): vertical lines
Blue (Azure): horizontal lines
Green (Vert): diagonal, top left to lower right
Purple (Purpure): diagonal, top right to lower left
Black (Sable): horizontal and vertical lines
Dark Red (Sanguine): diagonal lines in both directions
Orange (Tenne): diagonal lines, top right to lower left,
plus vertical lines

Metals:
Yellow, Gold (Or): dots
White, Silver (Argent): no marks

According to Francis J. Grant, formerly Lyon King of Arms.

--Ph. D.