Studies on the effectiveness of cranberry juice for preventing or treating UTIs have produced mixed results. The red berry contains a tannin that prevents E. coli bacteria - the most common cause of urinary tract infections - from sticking to the walls of the bladder, where they can cause infection.
primary color for pigments - any of three pigments from which all colors can be obtained by mixing; the primary colors for pigments are red, blue, and yellow. primary colour for pigments. primary color, primary colour - any of three colors from which all others can be obtained by mixing.
The Color Wheel: The Color Wheel shows the relationships between the colors. The three primary colors are red, yellow, and blue; they are the only colors that cannot be made by mixing two other colors. The three secondary colors are green, orange, and violet; they are each a mixture of two primary colors. Their hue is halfway between the two primary colors that were used to mix them.