'Are nanoscreens safe' is the question being asked by the Australian modeling study that claimed that nanoparticles, which are most effective, are invisible and are toxic in nature.

The outcome has surfaced from a study done by Dr Amanda Barnard of CSIRO Materials Science and Engineering in Melbourne about the effects of computer simulation of titanium dioxide nanoparticles.

Nanoparticles are employed in sunscreens to increase transparency thereby increasing their appeal to consumers. Adding further Dr. Barnard said, "The transparent ones do increase usage and protection from skin cancer in certain demographics, so they do have an important function."

However, a particular anxiety whether nanoparticles interact with sunlight to release free radicals, which in turn harms the tissues or DNA, is still to be answered. These nanaoparticles, ranged in size from 3 to 200 nanometres in size, are used for different types of sunscreens.

The study stated that particles less than 13 nanometers in size lessens the release of free radical production while maximising transparency and sun protection.