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.
Step one is to define our term. A primary color is a bright color that is useful for mixing other bright colors but cannot itself be made by mixing other colors. Yellow is the perfect example. Try mixing yellow from orange and green, and the result is very dirty, not yellow at all.