A new, straightforward online tool designed to standardise the description of bodily fluid colours could significantly ...

The ringaround will indicate what you need add or remove when making future prints to ensure you get the correct colour. If, for example, you make a print that matches the colour in the 20R photo just ...

Marcel Duchamp’s last painting has influenced artists for a century. Kelly Grovier looks at how it inspired the modern colour chart – and at its 17th-Century predecessor. This year marks the centenary ...