Water is not really blue

I'll be covering my opponent's rebuttals in the order presented, labelling as I go along.Water Changing Colors Based Upon Colored LightThe opponent argues that water can appear to have different colors based upon light passing through the water and various materials that may be present in water. I'll cover each. First, the light argument. It is true that if you shine a red light through water, the water appears red. This is largely due to the partial transparency of water, but it does nothing to prove that water isn't intrinsically blue. Consider that you can have two colored pieces of cellophane tape, one blue and one yellow. By placing the yellow piece on top of the blue piece, the result will appear to be a green cellophane piece of tape. This, however, does not change the colors of each individual piece of tape. The top sheet is still yellow and the bottom is still blue. The same goes for passing light through water. While the water will appear to be the color of that light (very slightly mixed with blue), the water itself is still blue. This is obvious when you remove the colored light and are left with (very slightly) blue water. The second point deals with particulates (like slime and mold) that may be present in the water. While this will appear to change the color of the water, one must realize that they are no longer looking at just water, but rather a mixture of two different substances. If you take some colored chalk, crush it into dust, then mix that with water -- the resulting mixture will appear the color of the chalk. What you're actually seeing, however, is the color of the chalk itself and the color of the water, blended together by your brain to form a new color. The brain is incapable of seeing very small color differentiations. The proof is actually directly in front of you. Take a magnifying glass or droplet of water and apply it to your computer screen. You'll see that the variety of colors you see are actually just red, green and blue so close together it appears to be a new color. Same goes for water with other materials in it. The water itself, the molecule, is still intrinsically blue. The Chemical Structure of WaterThe opponent states that hydrogen is not blue, that oxygen is not blue, therefore water should not be blue. I earlier presented evidence that very clearly demonstrated the molecule of water appears blue because of the vibrations inherent in its structure. Prefer my evidence to the opponent's assertion. Water is Blue Because of ReflectionsAgain, this is just an assertion. I have provided evidence proving that water itself is reflects back blue, while absorbing other colors in the spectrum. (Which makes it blue.) Yes, the sky is blue, which often makes water appear more blue than it actually is. However, if you had a large body of water underneath pure white light, the body of water would still appear blue. Note that the ocean still appears deep blue during a sunset, a time in which the sky is a red-orange color. ConclusionThe opponent used this round to make assertions without providing evidence to back them up. Last round, I presented a very clear, scientific source that demonstrates the "blueness" of water. Unless the opponent presents new evidence to the contrary, this evidence stands superior to all assertions made by the opponent in this debate. Thanks for reading.