Purity: Purification of Dyed Clothing with Kurr, Flowing, or Qalīl Water

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 161

If impure clothing that has been dyed with indigo or something similar is immersed in kurr or flowing water, it becomes pure if the water reaches all parts of it before the water becomes mixed with the colour of the clothing. If it is washed with qalīl water, in the event that at the time of wringing the mixed water does not come out, it becomes pure.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)