An curved arrow pointing right. Watch full episodes of the Science Channel series "How It's Made" on the Science GO app or at: http://insder.co/HowItsMade More from ...

And so it is for the New York jeweller Eva Fehren, whose Chroma collection celebrates that ubiquitous classroom classic, the highlighter pen. ‘My go-to colours are mostly black and white,' she says of ...

To understand how this works in highlighter pens, we can compare them to ordinary ballpoint pens. When light hits the ink of a blue pen, the ink reflects blue light and absorbs other colours ...