Cinnabar is forbidden in graves.

1, cinnabar is brightly colored, so it is not allowed to be used in memorial services, funerals and other ceremonies, which may leave a bad impression or be vicious. In the traditional geomantic theory, cinnabar is considered to be a fire element, while tombs belong to yin houses. The two attributes conflict with each other and should not exist at the same time. 2. Putting cinnabar may also lead to the variation and fading of the natural color in the tomb and the color naturally formed by time and environment, which will affect the overall feng shui and gas field of the tomb. Solemnly declare: the answer is for reference only, please don't be blindly superstitious.

Generally speaking, placing cinnabar in a grave is not respected. It is better to use other items suitable for commemoration and funeral.