<P> The U.S. city of San Francisco enacted a city ordinance, publicly identifying establishments that use nail polishes free of the "toxic trio" of dibutyl phthalate, toluene, and formaldehyde . </P> <P> Nail polish is considered a hazardous waste by some regulatory bodies such as the Los Angeles Department of Public Works . Many countries have strict restrictions on sending nail polish by mail . The "toxic trio" are currently being phased out, but there are still components of nail polish that could cause environmental concern . Chromium (III) oxide green and Prussian blue are common in nail polish and have shown evidence of going through chemical degradation, which could have a detrimental affect on health . </P>

Which of the following is present in nail polish remover