Why are we not allowed to write with red ink in official documents? Who can use Green, Blue, or Black ink Pens? Who is not allowed to use a red, and who cannot use a green pen? Who is not allowed to use a blue pen, and who can use a black pen? All these may be million-dollar questions to most of us. https://our-articles.com/facts/why-is-red-ink-not-allowed-in-official-documents/