Synthesis of and Fabric Test for Methyl Orange, and an Investigation of Acid-Base Properties of Textile Dyes By: Nick Fastuca Abstract: The azo-dye methyl orange was synthesized in two steps from sulfanilic acid and n,n-dimethylaniline with 52% yield. The reaction product was purified by recrystallization with water as the solvent. The synthesized methyl orange was tested to see how well it dyed 13 different kinds of fabric using a piece of Multifiber #43 cloth.  The dye bound most strongly to wool … Continue reading Synthesis of and Fabric Test for Methyl Orange, and an Investigation of Acid-Base Properties of Textile Dyes