If photosynthesis has occurred in a water body, the water itself may not change color, but the overall appearance can be affected by the presence of chlorophyll in plants and phytoplankton. Chlorophyll gives plants their green color, so areas with high concentrations of phytoplankton or aquatic plants may appear green. Additionally, if there's a significant amount of organic material or algal blooms, the water could appear green, blue-green, or even brown, depending on the types of organisms and their pigments. However, the water's basic color (clear, blue, etc.) typically remains unchanged directly due to photosynthesis itself.
What color will the water be if photosynthesis has occurred
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