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NOS Vintage J.S. Staedtler Mars 754 indelible pencils, medium hardnessNew!These are classic tracing pencils (German: Kopierstift), produced in Germany (Nuremberg) in the mid-20th century. The barrel features gold embossing with the brand\'s historical logo—the head of Mars, the Roman god of war—as well as the inscription \"Feinster Kopierstift\" (high-quality tracing pencil).
Model Features and Uses:Purpose: Indelible pencils contain a water-soluble dye in the lead. In the past, they were widely used for making carbon copies of documents, filling out official forms, and invoices, as the marks they left behind could not be erased undetected with an eraser.
Lead Properties: When writing normally, the pencil leaves a gray mark, similar to graphite. However, upon contact with moisture (by wetting the paper or the pen), the dye is activated and turns into a bright, permanent ink (usually purple).
Hardness: The \"754 Mittel\" designation indicates a medium-hard core, which ensures an optimal balance between line clarity and color intensity during copying.
