Abstract: Slasher machines and rope dyeing machines are the main dyeing machine that is used to continuously dye yarn fabrics for denim using indigo dyes. In denim dyeing, indigo (blue color VAT) and some sulfur dyes are mixed together to achieve blue/black/brown color denim fabrics. This invention is the achievement of dyeing reactive/direct/pigment/acid/disperse and other non VAT/sulfur OR its combinations of non VAT/sulfur dyes OR combinations between VAT/sulfur dyes and VAT/sulfur dyes on continuous yarn dyeing machines and relevant apparatus. Its products are also very distinguishable, especially its combinations, hence is a part of the invention.