A sample of soil which is being shown in Imam Hussain AS Holy Shrine Museum, which was taken from Imam Hussain AS grave, changed its color to red.

The event happened on the morning of 10th of Muharram.
The manager of the museum stated,” the soil was taken from nearest spot of Imam Hussain AS grave, and it is being shown in the entrance of the museum of the holy shrine.
It was turned from its natural color to red today’s morning during reading the martyrdom story in the courtyard of the holy shrine.
Karbala TV live-broadcasted the event on while covering the ceremonies of Ashura”

Source: imamhussain-lib.com