the 34 spacedyeing 34 step of the process according to this invention is that it provides a series of spaced colorations 45 upon the warp yarns 21 as indicated in fig1 this provides the highly desirable spaced colorations in the final warp yarn product as will further become apparent hereinafter following the 34 spacedyeing 34 step the prefabric 20 is conducted through a heat setting chamber 50 which performs the dual purpose of heat setting the dye that was applied in the 34 spacedyeing 34 step and also heat relaxing the crimp that was produced in the crimper 30 this beneficially develops the crimp producing a much bulkier or loftier yarn than would otherwise be produced and greatly enhances the value of the warp yarns for their ultimate use in tufted carpet products the heat set prefabric 20 is conducted in a downstream direction into a tank 60 which contains a dilute solution of a chemical which when concentrated has sufficient strength to attack and destroy the sacrificial filling yarn 22 in its entirety the solution contained within the container 60 is however dilute and the prefabric 20 remains intact at this stage of the process it will be appreciated that various types of yarns may be used as the sacrificial filling yarns and that correspondingly various types of solutions may be used in the tank 60 it is important to observe however that the solution used in the tank 60 is a dilute solution and does not attack the sacrificial filling yarns 22 to a.