There are two types of dyes which are used to dye wool for weaving: wegetable dyes and chemical dyes. Rugs and kilims which are made using natural dyes are the most preferred. The natural dyes are obtained from three sources: plants; animals; and minerals. Plant sources are used most widely in rug and kilim production. Some of the examples of colors obtained from plants and animal sources are: red (RUBIA TINTORIA); yellow (GENISTA TINTORIA); navy blue (ISOTIS TINTORIA and INDIGO FERETINTORIA); gray and black (OVER LUS); brown (JUNGLAND REGIA); and red (DACHYLOPIUS COCUS). Dyeing threads by using sources from nature is an art which has been practiced since ancient times. Anatolia has a large variety of plant available for dyeing purposes and this where the craft of dyeing has been improved through centuries of experience.