About Colored Copying Pencils
Colored copying pencils are often marked Colored Indelible and in German Tintenstift. These pencils are colored pencils with a dye or ink mixed with the color to produce a permanent (or indelible) mark when wet. Some of these colors are purple which is the standard copying pencil, however I have distinguished them by their dry mark. If they mark purple or any other color when dry then they are colored copying. What I consider regular copying pencils mark like a graphite pencil and then turn a color; usually purple when wet.