Fig. 6. General reaction route for the synthesis of the dyes. Where: dye A, “X” = p-aminobenzaldehyde, and “R” = cyanurated H-acid. Dye B “X” = 4-amino-3-nitrobenzaldehyde, and “R” = cyanurated H-acid. Dye C “X” = aniline, and “R” = cyanurated H-acid. Dye D, “X” = p-aminobenzaldehyde, and “R” = non-cyanurated H-acid.
