Before dyeing the raw materials (fibres, fabrics, clothes), they underlie some preparation processes such sizing, singeing, desizing, scouring, bleaching and mercerizing. The aforementioned processes are mainly used when the raw material is made of cotton, whereas when the raw material is made of wool there are some changes.

After the preparation processes of the raw material, the dyeing process takes place in special equipment with temperatures usually between 70 to 130 ^oC. The dyeing can be done on the threads, on the fabric or directly on the clothes. Several chemical subtances, whose quantities depends on the type of fabric, the colour of the dye and the technology applied, are added to the dyeing machines.

When the dyeing process is completed then the finishing of the fabrics takes place. The finishing includes wet and dry processes that aim to give the desired characteristics to the final product. The wet processes include the use of a large variety of chemicals in order to provide to the final product resistance to creases, to water (waterproofing), to fire, etc and to protect it from moth, bacterias, etc. On the other hand, the dry processes aim to give certain characteristics to the surface of the final product which can be noticed either visually or through touching, such as ironing, steaming, etc.