STEP 4: Remove the cover and the mushroom cap. Observe the color of the spores that were deposited, and use that color for identification. Some mushrooms deposit white spores, which are hard to see on the white paper. Set a strong flashlight beside the paper, shining across the surface, to assist your identification of pure white spores. Check the color you see against several guides, and double check the mushroom’s structures against similar mushrooms to ensure that your mushroom really is safe.