writing ink meaning in Hindi

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Gall-nuts were also used for making fine black writing ink.
Writing ink is usually water-based and is much less viscous than the oil-based inks used in printing.
It writes ink, like any other pen.
These first writing inks were based on naturally occurring minerals like graphite & vermilion; earliest inks were probably liquids and not preserved.
Red light was used for this purpose, giving a good contrast to ordinary writing ink colours and enabling machine reading of postcodes.
Taking an old tin of writing ink . . . with my finger I dipped into the black residue and smoothed it over the tusk.
Two types of ink were prevalent at the time : the Greek and Roman writing ink ( soot, glue, and water ) and the 12th century variety composed of ferrous sulfate, gall, gum, and water.
The Popular Science iron gall writing ink article also mentions methyl violet dye could be used to make a violet iron gall ink without revealing the amount and soluble nigrosine dye for an immediate black iron gall ink.
The first test, using thin layer chromatography ( TLC ) revealed the ink contained no iron, and was based on a synthetic dye called nigrosine, patented and commercially available in 1867, and in general use in writing inks by the 1870s.
:I'm not familiar with the details about how they would react, but I would note that common writing ink until very recently was iron gall ink, made from iron compounds and tannin rich oak galls .-- talk ) 03 : 32, 20 March 2009 ( UTC)

noun.