The first synthesis using the ketone, 2-napthol, and aldehyde,nitroaniline, produced a red colored para red solution while the other reaction with p-anisidine and 1-naphthol produced a darker red colored solution. The difference in colors of both azo dye was because of the difference in the attachment of the hydroxyl group to the compound. 1-naphthal contains a hydroxyl group on the first carbon, ortho to the attached benzo group while 1-naphthol contains a hydroxyl group on it’s second carbon, meta to the attached benzo group. The difference in color change can also been as a result of the aldehydes used in the solutions.