Hydrogen peroxide and Lactic acid Wick index are some of the most important parameters when the liquid board will be quality assured of the manufacture. The goal of this study is to improve and develop the existing analysis methods that Billerud AB uses to analyze the edge penetration of hydrogen peroxide and lactic acid in liquid boards. The purpose of this work is to gain an increased understanding of the edge penetration in the different layers of the liquid carton. This will be investigated by developing the existing analytical methods by adding two different colors. The color allows us to visualize the penetration into the different layers. Thus, the goal is to map whether the colored analysis methods affect the analysis result depending on which color is used compared to the unstained analysis methods and whether there are advantages/disadvantages if the colored methods will be used compared to the unstained methods. Comparison between modified methods and non-modified methods was built on cardboard samples from the archive, but also fresh samples from the board machine. The theory that was used as a starting point to compare the colored methods with the original ones is Lucas Washburn's theory. Therefore, all the parameters found in the Lucas Washburn theory have been investigated for both colored/uncolored liquids. In addition, the wick index has also been compared. Results have shown that there is no major difference in wick index between the colored liquids and the uncolored ones. In contrast, color nr 1 gave good color penetration compared to color nr 2 due to the good compatibility between the liquids and the paint. Other advantages that could be found with the colored methods with color nr 1 are that the colored methods can be used to get an idea of how well the bonding has been in the different layers, the troubleshooting of the process, and detect handling errors that can lead to an incorrect value on the wick index.