writing ink
noun
: ink that is to be used with a pen and that may be permanent (as a blue-black ink) consisting essentially of a dispersion of gallic acid or tannin, ferrous sulfate, and often a blue dye in water or nonpermanent containing soluble dyes and including washable inks compare india ink sense 2
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“Writing ink.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/writing%20ink. Accessed 22 Nov. 2024.
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