Bleach can be used to remove color from another substance or clean the water we humans drink every day. Although bleach is very useful and commonly used in our environment, it is also very reactive and unstable if not used properly. For my experiment I will make an electronic device that will work as a colorimeter. Using the colorimeter, I will measure the concentration of the blue dye in sports drinks and find the rate at which the dye disappears when mixed with bleach in different dye concentrations. The research question for this project is: “How does the amount of bleach mixed in a blue dye solution affect the total time it takes for different concentrations of blue dye to disappear?” Other people may have done this project before me, but none of them were reported. If a substance has color, then you can determine its concentration by light absorption, which is when light is absorbed by an object or spectrum. The Beer-Lambert law is commonly used to find the absorbance (A) of light in a solution by multiplying the molar absorption coefficient (ε) (how well a chemical absorbs light at a given wavelength), the concentration (C) and the path of light through the sample solution (l). The equation for this relationship is “A=εCl”. The color of the solution is determined by the color of the light that the molecules do not absorb, so, say if you had a blue colored solution, the color of the light would be orange. This is because the highest molar absorption coefficient for the blue dye falls around 620 nanometers, which is the orange part of the visible electromagnetic spectrum. The molar absorption coefficient can be found in an absorption spectrum. The absorption spectra are generated… in the center of the paper… for this experiment is: “If you increase the amount of bleach drops mixed into a blue dye solution, the total time required for the blue dye in the solution to disappear will decrease. In other words, I think the blue dye in the solution will disappear faster when you increase the amount of bleach. The research I have gathered has helped me better understand why and how I will do my experiments the way I am doing them .It also supports my hypothesis.It also supports my hypothesis because I found that there is an active ingredient in bleach known as hypochlorite molecule. This molecule helps to break bonds in pigment molecules, so I think the more bleach you use, the faster i bonds will break.In this experiment, I will find out how much dye is mixed into sports drinks and what is the reaction rate of bleach and blue dye.