The inhibition effect of New Fuchsin dye on the corrosion of mild steel in 1 M HCl was studied using electrochemical noise measurements (ENM) and the electrochemical impedance spectroscopy (EIS) method. The experimental results indicated that, the New Fuchsin is effective inhibitor even in very low concentration (5 ppm). EIS studies showed that the polarization resistance of mild steel in 1 M HCl increases as the inhibitor concentration increases. Experimental results showed that the DC trend can affect the results obtained from analysis of electrochemical noise data in time domain. DC trend of electrochemical noise data was removed by MAR method. After trend removal, electrochemical noise resistance is confirmed to be strongly correlated to polarization resistance.