What are the Feng Shui taboos on the color of bathroom doors?

Under normal circumstances, it is not advisable to use red for bathroom doors, because the five elements of red are fire, and the five elements of bathroom are water, which is suspected of being incompatible with water and fire. But there are two situations where red doors can be used in bathrooms: first, the bathroom door is in the Zhen Palace or Xun Palace position of the entire home; second, the bathroom door is made of solid wood. Because these two situations can just form the five-element circulation pattern of water producing wood and wood producing fire.