This will cause a darkening or brightening of the image. It provides pigments with light fastness and prevents clear polymers from darkening in sunlight. There is redness, scaling, darkening of the skin, and itching. As adults age, a gradual darkening of the yellowish banding occurs. Hair growth develops under the arms, starting out sparse before thickening and darkening over time. Multiply and Screen blend modes are basic blend modes for darkening and lightening images, respectively. Darkening of the skin in certain areas may also occur. Darkening of the skin is also caused by decomposition. She began darkening her skin and perming her hair sometime around 2011. However, the luminance is not constant across the disk of the Sun (limb darkening). Meanwhile, the political sky is darkening. The windows stared towards the darkening foothills. Ammonia fuming is a traditional process for darkening and enriching the color of white oak. As an enforcer, he has darkening the hues of five Inspectors that he once served. This carbohydrate buildup often can be observed by the darkening of leaves.