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.
Red, green, and blue are the primary stimuli for human color perception and are the primary additive colors. The relationship between the colors can be seen in this illustration: The secondary colors of RGB, cyan, magenta, and yellow, are formed by the mixture of two of the primaries and the exclusion of the third. Red and green combine to make yellow, green and blue make cyan, blue and red make magenta.