Both warp(tano) & weft(vano) is dyed before the weaving begins. This requires expertise and pin-point accuracy as displacement of even one thread may result in a deformed pattern on the cloth.
They are so unique that they are the geographical indication tags for Gujarat as Rajkot Patolas and Andhra Pradesh as Bhoodan Pochampally.
Handcrafted Patola (also called Patolu) from rajkot is a double Ikat fabric manufactured only for direct clint.