My experiment consists of 3 bottles of water. I added blue food coloring to one bottle, and red food coloring to another bottle, and the last bottle of water i added nothing. I’ve noticed the bottle of water I added nothing to, is evaporating faster than the blue and red water. Why is this? LKPete The short answer is that the “color” of water has no effect on evaporation. But this is because water, by itself, has no color, instead only reflecting the sky (the ocean on a cloudy day will be as gray as the clouds). You might make a case for any substance within the water that gives it color (algea, chemicals, etc.) that might change the water’s viscosity, and, therefore, the rate at which it evaporates. Good Luck! Carlin Jamieson-Dolan : Different coloured objects absorb different amounts of heat. A black car for instance will get significantly hotter on the inside than a white car. Another reason the uncoloured water may be evaporating faster is because the food colouring chemical itself