 Those made of rayon have about 3,000 warp threads on average and those made of real silk have about 3,800.The dying process is done before weaving, with the most common technique being the ikat method, sometimes called "amarrado" (lit.stingy) In the most traditional work, thread is dyed with natural colors, with colors such as black, blue, red, purple and green but synthetic dyes are now often used.