I thought it had some kind of white stuff on it when I unrolled the rug.  The rug is beautiful when the nap is brushed one way, but if you don't, the underside of some of the yarn is white and it looks like the carpet is flawed (tried to take a pic but hard to capture - one is brushed correctly and one against the grain).  My guess is the color was added on top of the rug and didn't coat the underside.   It's kind of thin, but about what I expected for the price and the rug pad adds enough cushion.  Not sure if I'll send it back yet.