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The process wherein the fabric is first handled with a solution of the coupling component after which positioned in an answer of the diazonium salt to form the dye on the fabric was patented in 1880. Alternatively, the fabric might be handled with a solution of the diazo part earlier than diazotization, adopted by immersion in an answer of the coupling part; this process was patented in 1887. These are ingrain dyeing methods. The -OH and -NH2 teams direct the coupling to the ortho and para sites, and the directive results are pH-dependent.