We've been prepping you for the new season with our Fall Beauty Guide for the last couple of weeks, but now that Labor Day has come and gone and all linen clothing at the GAP is officially 70 percent off, there's no more denying that summer is O.V.E.R. Gentle nudging will no longer suffice so I'll be blunt and say, "Ladies, grab that nail polish remover and get those nails in order."

Fall trends always bring out the darker side of nail polish colors and this season is no exception. Trade coral for deep, plum reds, soft gray for black or metallic hues, and neon/robin egg's blue for a navy, midnight blue shade.

Here are some of the colors I'll be trying this fall:

• OPI Nail Lacquer in William Tell Me, $7.99: a dark and mysterious deep wine purple

• China Glaze Nail Lacquer in Midnight Mission, $6.50: a sparkly asphalt blue

• Chanel Le Vernis Nail Colour in Rouge Fatal, $23: a vampy, vixen red

• Milani Nail Lacquer in Black Magic, $4.50: an inky black

And because these deep colors will likely be hard on your nails, ward off yellowing by:

• Always using a base coat

• Soaking nails in lemon juice and water for about five minutes

• Using an old toothbrush and some whitening toothpaste to scrub your nail beds to reduce staining