The hex color #b51a5c is a dark color. The web-safe version is Hex
#CC3366. A complementary color is
#4AE5A3. The grayscale version is
#646464. A 20% lighter version of the original color is
#E84D8F, and Hex
#820029 is the 20% darker color. If the color is saturated by 10%, you get
#BD135B. If the color is desaturated by 10%, the color
#AD215D is obtained.