Investigate a variety of black ink markers, and find out why they look black. Blank inks are usually mixtures of a variety of colored ink pigments in liquid solvents. Chromatography is a technique ...

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Rodolpho Torres, from São Paulo, uses flesh-coloured ink to tattoo in between stretch marks, which appears to blend and create a more even skin tone. Here are just some examples of his work: However ...

Hand-written notes are quick and easy, but without the ability to properly interact with our digital world, it can also mean ...