The new method is called micro-encapsulation, where particles are suspended in a biodegradable polymer coating. The microcapsules, that are as tiny as pins, can bear a molecule that requires protection or restrained release.
The process is widely used in manufacturing plant food, stain remover, and even scratch-and-sniff perfume ads, where scent is released upon scratching a treated paper.
Researchers at Brown University have made microencapsulated beads filled with dyes that do not have heavy metals and other toxins, making it easy it easy to get it removed.
"Microencapsulation is a real science and a real art," Live Science quoted said researcher Edith Mathiowitz, as saying.