A method for monitoring content of a coating solution for coating components includes supplying a tank with the coating solution containing a concentration of a solvent and a concentration of a coating material. The concentration of the coating material is tested using a titration process. The titration process may include controllably contacting a volume of the coating solution with a reagent solution to form a mixture and using a color processing device to obtain input color data of the mixture to detect an end-point of the titration process. One or both of the solvent and the coating material is supplied to the tank based on an amount of coating solution contacted with the reagent solution when the color processing device detects an input color data signaling the end-point of the titration process.