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Blend the shadows.

Article:
Clean your dome brush with brush cleaner or soap and water, and dry it completely on a clean cloth. Use it in a soft, brushing motion to blend the two colors together on your eyelid. Avoid bringing the darkest color too close to the center of your lid, as this will muddy the highlighted section you have created. Blend the outer edges of your eyeshadow as well, so there are no harsh colorblocking lines or sections on your lid.