Compound X plays important roles in a wide range of biological processes in human including cell growth, energy production, and the metabolism of biomolecules. Compound X can be found in healthy diet in humans and animals to support body growth and development. Shown below is an absorption spectrum for compound X in water (black), acetonitrile (red) and dimethyl sulfoxide (green). Estimate the optimum wavelength (nm) for compound X. What is the color of compound X in water?