In Petra Sancta's method, illustrated in the table above, a separate hatching represents each metal and colour, while the furs are treated as combinations of metal and colour. Argent is represented by a plain field, while or is represented by a field strewn with dots. Gules is represented by vertical lines, azure by horizontal lines, and sable by a combination of horizontal and vertical lines. Diagonal lines running from dexter chief to sinister base represent vert, while purpure is the reverse, represented by diagonal lines running from sinister chief to dexter base. Sanguine is represented by diagonal lines running in each direction, while tenné is represented by a combination of horizontal lines and diagonal lines running from sinister chief to dexter base.