harshgoel1975 Posted October 6, 2014 Share Posted October 6, 2014 Question : Can you write in blue color using a red ink pen Answer is yes but how ? Link to comment Share on other sites More sharing options...
swansont Posted October 6, 2014 Share Posted October 6, 2014 The answer is no, but you can see blue from a red pen. State at the writing for ~30 seconds and then at a white surface and you will see a blu-ish afterimage, owing to retinal fatigue. http://en.wikipedia.org/wiki/Afterimage Link to comment Share on other sites More sharing options...
Sato Posted October 6, 2014 Share Posted October 6, 2014 Yes, the paper can contain a material that, when interacting with red ink, turns blue, and so you'd effectively see blue writing from red ink. Link to comment Share on other sites More sharing options...
harshgoel1975 Posted October 6, 2014 Author Share Posted October 6, 2014 Simple answer is yes,...in blue color.... in red color.. in black color..... :) read this ... this is written "in blue color" 1 Link to comment Share on other sites More sharing options...
swansont Posted October 6, 2014 Share Posted October 6, 2014 So this being phrased as a scientific question was part of the setup, rather than saying it was a brain teaser? Link to comment Share on other sites More sharing options...
harshgoel1975 Posted October 8, 2014 Author Share Posted October 8, 2014 Sir, a little chap troubled me with this question.......question and answer are both looks correct....This is why I posted in The Lounge ... Link to comment Share on other sites More sharing options...
elfmotat Posted October 8, 2014 Share Posted October 8, 2014 Yes: write your message in red ink, then accelerate it near the speed of light toward its recipient. The light from the message will be blue-shifted, and will in fact be blue at high enough speeds. 1 Link to comment Share on other sites More sharing options...
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