Golran (the company was formed in 1898), is based in Italy and specializes in premium quality antique and contemporary oriental carpets.  What caught my eye was their range of  Decolorised carpet:  Vintage carpets that are knotted by hand, and are then subjected to a decoloration process followed by re-dyeing with monochromatic vegetal dyes.  I wonder how easy this would be to do at home?