The purpose of this lab was to determine why solutions have different colors. The perception of color is determined by the light that is transmitted or reflected by the solution. The colors that the solution does not absorb are the ones that are transmitted are seen. The colors not seen are the ones that the solution absorbs. Because a colorless solution absorbs all the colors, no color is transmitted or seen. When talking about light, there are three primary colors: red, green, and blue. Absorption depends on wavelength so the ability of a substance to absorb light is different for photons with different wavelengths. In this lab, we looked at five solutions with different colors and predict what the absorption spectra for each one would be like. Then each color was tested to see their absorption spectra with the red tide device.