Tish'a B'Av: Hand Washing

On Tish'a B'Av, as on Yom Kippur, if you must wash your hands to remove:
  • Tum'a, you may wash your hands only up to the knuckle that connects your fingers to the rest of your hand (thumb: second knuckle; fingers: third knuckle).
  • Dirt from your hand, you may wash wherever the dirt is on your hand.