Travertine and limestone are sedimentary stones and much softer than other materials commonly used in kitchens. Limestone is heavily fossilized which gives it great character. Most limestone from the United States is light in color, ranging from yellow to pink to gray in color. Limestone imported from other countries is often light or even dark red, brown or black. Most natural travertine is dark, ranging from ecru to dark red, with a variety of vein colors. Due to the porous nature of travertine and limestones they are not the best selection for outdoor applications, however, can be sealed and polished for protection as countertops.  Honed travertine bathroom floors and curb less showers create a warm cozy Tuscan bathroom look.