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Fabian (fabian83@chaos.social)'s status on Wednesday, 01-Jan-2025 07:30:28 JST Fabian
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- AndroidArts
@androidarts
https://en.wikipedia.org/wiki/Copying_pencil perhaps?
In conversation about 4 months ago from chaos.social permalink
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  Copying pencil
  
  A copying pencil, also an indelible pencil or chemical pencil, is a 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. History 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 it down with a mechanical press. The water-soluble dye in the writing would be transferred in its mirror image to the tissue paper, which could then be read in verso by holding it up to a light source. According to paper conservator Liz Dube, "By the 1870s, letter copying books became the ubiquitous copying tool for businesses. These volumes contained hundreds of leaves of thin tissue paper, often high quality Japanese papers, bound together for the purpose of bearing copies of outgoing correspondence and other business documents." The most commonly...
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  AndroidArts (androidarts@mastodon.gamedev.place)'s status on Wednesday, 01-Jan-2025 07:30:29 JST AndroidArts
  
  I have this box of unused new pencils from like... well, they're older than me.
  800 • Catullus • A.B. Stiftet • Kopie Medium
  Company active between 1947-1961.
  Anyways, they're regular gray pencils. Except they're not!
  I noticed that some of my drawings have blue lines.
  But when I draw with the pencils they're gray.
  So... the lines... react with something (Paper? Air?) and shift over time (days)? The blue also won't erase well. Seems to have happened to other people, who are also clueless.
  
  In conversation about 4 months ago permalink

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