It can be difficult to remove dark methylene blue (MB) from water effectively. The use of sodium alginate and bentonite (Ben) as the matrix produced a displacement reaction that occurred in cobalt ...

A bigger risk is the challenge of following through. Natural dyes are trickier to keep stable under heat or light. Reds fade ...

It joined a growing number of big food companies that announced plans to eliminate such dyes as the U.S. government stepped ...