1 Clean your brush and use clean water or a second color to paint inside the outline, being sure to blend with the outer color. 2  Leave the middle white. 3  For a dark center, paint it in once the flower has dried.  For a light center, paint it while the flower is still wet to blend.
The main function of vitamin A is to support vision, especially in dim lighting, by creating pigments that are needed to help keep the retina of the eye healthy. It also helps produce the protein rhodopsin, which absorbs light in the retina. In addition, vitamin A helps support the growth and development of the cornea and other membranes of the eye.
When those linings break down, bacteria can enter the body and cause infection. Vitamin A also helps maintain the integrity of skin and mucous membranes that function as a barrier to bacteria and viruses. Vitamin A helps in part to regulate the immune system. The immune system helps prevent or fight off infections by making white blood cells that destroy harmful bacteria and viruses. Vitamin A appears to help lymphocytes, a type of white blood cell that fights infections, function more effectively.