Fact checked by Nick Blackmer When you get a magnetic resonance imaging (MRI) scan, you might get an injection of a contrast ...

Carminic acid's color is pH-dependent ... ways to use cochineal bugs to make pigments that could color fabrics and other materials. This dye was once so highly prized that bags of the dried bugs were ...

Natural dyes may be less stable than synthetic dyes and may be affected by factors including heat and acid levels. “It’s not ...

This is a good dye; and although it colors the finger-Snails and the hair, it scarcely stains the skin —the gum arabic and gallic acid preventing it from doing this. Considerable of the coloring ...

An curved arrow pointing right. Cochineals are tiny bugs that live on prickly pear cactuses. The acid in their guts makes a red dye used in textiles, cosmetics, and foods like M&Ms and Yoplait yogurt.