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2. Dye penetrant inspection - Wikipedia

   en.wikipedia.org/wiki/Dye_penetrant_inspection

   Choice of developer is governed by penetrant compatibility (one can't use water-soluble or -suspendable developer with water-washable penetrant), and by inspection conditions. When using non-aqueous wet developer (NAWD) or dry powder, the sample must be dried prior to application, while soluble and suspendable developers are applied with the ...

3. UV marker - Wikipedia

   en.wikipedia.org/wiki/UV_Marker

   Messages written by a UV marker can be discovered by unintended viewers when there is a change of reflectivity of the paper, or a pen scratches marks on the paper. The smell of the ink also reduces the security of secret messages as the hidden messages can be easily found with the help of trained animals.

4. Permanent marker - Wikipedia

   en.wikipedia.org/wiki/Permanent_marker

   In general, permanent marker ink comprises a main carrier solvent, a glyceride, a pyrrolidone, a resin, and a colorant, [1] making it water resistant.It is capable of writing on a variety of surfaces from paper to metal to stone.

5. Marker pen - Wikipedia

   en.wikipedia.org/wiki/Marker_pen

   The tip of a green felt-tip pen A box of colored felt-tip pens Marker pen. A marker pen, fine liner, marking pen, felt-tip pen, felt pen, flow marker, sign pen (in South Korea), vivid (in New Zealand), flomaster (in East and South Slavic countries), texta (in Australia), sketch pen (in South Asia), koki (in South Africa) or simply marker is a pen which has its own ink source and a tip made of ...

6. Scratchboard - Wikipedia

   en.wikipedia.org/wiki/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 India ink .

7. Scratch and sniff - Wikipedia

   en.wikipedia.org/wiki/Scratch_and_sniff

   DC Comics published a scratch-and-sniff-themed Annual issue of Harley Quinn in 2014. [22] Marina and the Diamonds made a 6 vinyl disc pack for her album Froot that each contained a scratch and sniff surface on the sleeves. King Gizzard & the Lizard Wizard included a banana-scented scratch-and-sniff sticker on their album Flying Microtonal Banana.