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2. Invisible ink - Wikipedia

   en.wikipedia.org/wiki/Invisible_ink

   Invisible ink. A coded letter from Benedict Arnold, originally written in invisible ink. Handwriting by Peggy Shippen Arnold is interspersed with coded communication in Arnold's hand. Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and ...

3. Scratchboard - Wikipedia

   en.wikipedia.org/wiki/Scratchboard

   Scratchboard. Scratchboard or scraperboard or scratch art[1] is a form of direct engraving where the artist scratches off dark ink to reveal a white or colored layer beneath. The technique uses sharp knives and tools for engraving into the scratchboard, which is usually cardboard covered in a thin layer of white China clay coated with black ...

4. Scratch (programming language) - Wikipedia

   en.wikipedia.org/wiki/Scratch_(programming_language)

   Scratch is a high-level, block-based visual programming language and website aimed primarily at children as an educational tool, with a target audience of ages 8 to 16. [8] Users on the site can create projects on the website using a block-like interface. Scratch was conceived and designed through collaborative National Science Foundation ...

5. List of pen types, brands and companies - Wikipedia

   en.wikipedia.org/wiki/List_of_pen_types,_brands...

   A pen is a handheld device used to apply ink to a surface, usually paper, for writing or drawing. [1] Additional types of specialized pens are used in specific types of applications and environments such as in artwork, electronics, digital scanning and spaceflight, and computing.

6. Open-source software - Wikipedia

   en.wikipedia.org/wiki/Open-source_software

   This is an accepted version of this page This is the latest accepted revision, reviewed on 12 September 2024. Software licensed to ensure source code usage rights Open-source software shares similarities with free software and is part of the broader term free and open-source software. For broader coverage of this topic, see Open-source-software movement. It has been suggested that this article ...

7. Technical pen - Wikipedia

   en.wikipedia.org/wiki/Technical_pen

   Macro image of a 0.7 mm Rotring Rapidograph nib showing the flow control wire. A technical pen is a specialized instrument used by an engineer, architect, or drafter to make lines of constant width for architectural, engineering, or technical drawings. Technical pens may use either a refillable ink reservoir or a replaceable ink cartridge.