constructed of undyed, but ready-for-dyeing, fabrics. Terms for different dyed materials There are various terms used in the manufacturing and marketing industries depending on the method used to dye the substrate. For example, "stock dyed" refers to dyeing the fibers before making the yarn, "yarn dyed" refers to dyeing the yarns before producing fabrics, and "piece dyed" or "fabric dyed" refers to dyeing the yarns after they are converted into fabric. The fastness of fiber- and yarn-dyed materials is superior to that of fabrics. Objective The primary objective of dyeing is to apply uniform color to the substrate (fiber, yarn, or fabric) with required color fastness. Tie-dye and printing are the methods where the color is applied in a localized manner. Application Exhaust method In the exhaust method, the dye is transported to the substrate by the dye liquor's motion. The dye is adsorbed onto the fibre surface and ideally diffuses into the whole of the fibre. Water consumption in exhaust application is higher than the continuous dyeing method. There are three corresponding ways of dyeing with the exhaust method. Liqour circulating: loose stock, sliver, tow, yarn or fabric, is packed into canisters, wound onto cones or perforated beams and placed inside the dyeing vessel. In this way the liqour is pumped and revolves through the material which is stationary. Material circulating: Fabric winch dyeing and jiggers are the few forms in which material remains in motion and liqour stationary. In this the material moves through the stationary liqour. Liqour and material both in motion: Jet dyeing and softflow dyeing application methods where material and liqour both remain in motion. Continuous method In continuous method dye is transported to the substrate by passing it through the different stages but continuously. The continuous method is an innovative method where many discrete dyeing stages are combined, such as applying color, fixation and, washing off of unfixed dyes. Types of continuous dyeing are as follows Pad-steam Pad dry Thermosol Cold pad batch method is a semi-continuous dyeing process. Waterless dyeing method Waterless dyeing, also known as dry dyeing, is the newly developed and more sustainable dyeing method in which the dyes are applied to the substrate with the help of carbon dioxide or solutions that need less or no water compared to their counterparts. Selection of dyes The selection of the appropriate dyes is most important because any given dye does not apply