Question: azo dyes are acidic or basic?
Answer: Physical properties, structure, and bonding As a consequence of п-delocalization, aryl azo compounds have vivid colors, especially reds, oranges, and yellows. ... Some azo compounds, e.g., methyl orange, are used as acid-base indicators. Most DVD-R/+R and some CD-R discs use blue azo dye as the recording layer.