If you have blonde hair with warm undertones, warm blondes have honey and bronze tones in their hair, and are generally slightly darker. For glasses, warm blondes can run the gamut of warm colors including Hemlock, Tortoise, and Peach shades. However, if you have blonde with cool undertone, cool blondes have ashy undertones and lean toward the platinum end of the spectrum. Cool blondes can easily wear black, blue, dark tortoise and pink tones. Avoid colors with strong yellow or gold undertones. If you have brown hair with cool undertones, cool brunettes are usually lighter in shade and have ash undertones. Go for black, pink, blue, and dark tortoise for the best effect. But if you have brown hair with warm undertones, warm browns tend to be darker shades with more auburn and red tones. Stick with lighter tortoise shades that have warm undertones such as Hemlock or Bourbon, or go with warm greens, reds, or creamy off-whites. If you have red hair, the inherent vibrance of red hair makes it an ideal partner for strong frame colors. Try rich tortoise, black, green & warm neutrals like cream. Avoid Ashy and yellowy tones that will undermine redheads. If you have black hair, of course black hair looks great with black and dark tortoise frames but black hair also provides a strong counterpoint to saturated brights such as Sea and Cranberry. Go for black, Olive Tortoise, Malt and bold Pacific. Avoid diluted or ashy tones as they may appear washed out. If you have grey and white hair, all tones of grey hair provide an excellent chance to wear clean and bright colors. Try Black, Cadet, and Cherry. Stay away from yellow and brown frames that have a dulling effect.