ARA everyone likes. It is a saying that warns of the subjectivity of tastes and preferences of each. We live in the XXI century and since the end of the last century we have the possibility of many colors represent a variety of ways, easily and at a relatively low cost. We even have multiple systems management thereof.
Pantone color palette.
The system to represent the colors on a computer monitor is RGB system. RGB is a combination of red, green and blue. It is a reliable way to represent a color. For print professionals is better to tell the colors with the CMYK gamut. Also a combination CMYK RGB type, therefore is also reliable. Another color management system is the Pantone palette. Pantone colors is numbered so that giving your reference can compose a pot of paint desired shade. Pantone is a trading system, so it is not advisable to reference your color palette, because as the owner of the code, can change anytime.
RGB, CMYK and Pantone, like others, are modern color spaces. In the twelfth century devised a “color space” for heraldry.
Unlike now had to define the exact methods to use chromaticism. The gules is red, period. What is red? it is the color of blood, poppies color or some roses. , Come on, you know what the red and if you do not have a problem.
Formerly the books were luxury items. The acquisition of a book was in the hands of a few and there were few who could afford the cost of doing a book manuscript. Still, with these books had the opportunity to represent the blue, red, gold, green … of glazes. With the advancement of technology and the invention of printing was achieved very efficiently in the production of a book referring to what came before.
Europeans associate the invention of the Gutenberg printing press, but Asians had already printed books centuries before we did it. More than a figment of a person was the evolution of culture. Thanks to this method could be stamping letters on paper and then bind. It took quite in assembling the letters to make a sheet, but once assembled it was very easy to make duplicates. He gained in effectiveness, but was lost in elasticity. Now was printed in one ink and could not represent colors.
A priest heraldista Silvestro da Pietrasanta Italian named Petra Sancta or Sylvester or Silvester Petra Sancta Petrasancta or Pietrasanta or Sylvester or Sylvester resembling in some language and “Holy Stone” in another, also known by his pseudonym Coelius Servilius invented in 1638 a system of traces to represent the enamel without the need to do with color.
And with this system may represent a single ink around a heraldic shield:
Party: 1 gold, an eagle of saber gold 2nd, a tree vert gules fruity with a steep boar sable, defended and armed gules, surmounted of three growing ranversados azure.
To see more types of scratches to enamels called secondary raw, etc. should not be used, look at the entry written at the time. I leave the link at the end:
An excellent article on using hatching in emblazoned arms: