Nitrates and nitrites give processed meats their characteristic pink colour and robust flavour. Although many consumers want to limit consumption of these preservatives because the substances can form potentially cancer-causing compounds, knowing how much is in food has been difficult to determine. Now, researchers reporting in ACS Applied Materials & Interfaces have developed a colour-changing film that consumers can stick onto foods and easily analyse nitrite levels by snapping a … [Read more...] about Stickers and a smartphone for easy nitrite detection on foods