Copying pencil Copying pencil A copying pencil, also indelible pencil or chemical pencil, is pencil whose lead contains a dye. The lead is fabricated by adding a dry water-soluble permanent dye to powdered graphite—used in standard graphite pencils—before binding the mixture with clay. Copying pencils were introduced in the 1870s and were originally marketed for copying documents, especially for making permanent copies of a permanent original. This was achieved by creating a hand-written document using a copying pencil, laying a moist tissue paper over the document and pressing down with a mechanical press. The water-soluble dye in the writing would be transferred
Nord Lead Nord Lead The Nord Lead is a series of virtual analog subtractive synthesizers, manufactured by Clavia. Released in 1994, the original Nord Lead was the digital synthesizer that made the term "virtual analog synthesis" popular. The now widely accepted term "virtual analog", was first coined by Clavia with the release of the Nord Lead. This synthesizer was distinctive for its red coloration, knob-laden surface and unique pitch-stick and modulation wheel. After the Nord Lead, several updates followed suit; such as the Nord Lead 2, Nord Lead 3, and Nord Lead 2x. The first Nord Lead was released in 1995 to