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The tip of a gel pen. A gel pen uses ink in which pigment is suspended in a water-based gel. [1] Because the ink is thick and opaque, it shows up more clearly on slick surfaces than the typical inks used in ballpoint or felt tip pens. Gel pens can be used for many types of writing and illustration.
Top to bottom: blue Lamy T 10 proprietary ink cartridge and Z 27 and Z 28 ink converters. Fountain pens carry ink within the barrel, traditionally either inserted at one end in bulk with a syringe or eyedropper pipette, or through a mechanical filling system built into the pen (such as a piston or vacuum-pump mechanism).
After 14 days' storage in a glass container the ink must not have stained the glass or show sedimentation. Eight-day-old writings, after washing with water and alcohol, must remain very dark. The ink must flow easily from the pen, and may not be sticky even immediately after drying. [20]
Ink is used for drawing or writing with a pen, brush, reed pen, or quill. Thicker inks, in paste form, are used extensively in letterpress and lithographic printing . Ink can be a complex medium, composed of solvents , pigments, dyes , resins , lubricants , solubilizers , surfactants , particulate matter , fluorescents , and other materials.
In addition to being used for labelling microscopy slides, permanent markers can be used to do a negative stain of a bacterial sample. This means the background is stained with the marker, but the bacteria are not. The bacteria can be seen because they are unstained (lighter) while the background is stained (darker). [2]
The Parker 51 is a fountain pen first introduced in 1941. Parker marketed it as "The World’s Most Wanted Pen", a slogan alluding to restrictions on production of consumer goods for civilian markets in the United States during World War II. Parker's continual advertising during the war created demand that took several years to fulfil after the ...