There are a number of standard color names that are supported in Inkscape and that can be useful to know about when using the countersheetsextension. New names can be added by using Inkscape swatches (see).

The following table was created using the countersheetsextension and the included colors.svg and svgcolors.csv example files. Color list was fetched from https://developer.mozilla.org/en-US/docs/Web/CSS/color_value.