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Use only black and white photography when a certain application requires it ( example : black and white ad ) . One example might be Honeycrisp apples , where one or two applications of Pristine in late summer may help to prevent postharvest development of bitter rot , black rot , white rot , gray mold , and blue mold . The white rot fungus does not infect leaf tissue . Thus , at the appropriate hour , she chalked a Solomon 's Seal upon the floor of her tower , filled three copper braziers with suitable herbs and resins , lit thirteen beeswax candles stolen from the local church ( Elaine was always especially generous to the parish poor-box to make up for her thefts , and would not have made them at all save for the inconvenient fact that her recipes demanded them ) , draped a white silk pall over the mutton chops , and began her conjuration . Scattered clumps of black fruiting structures ( pycnidia ) develop on surfaces of fruit with advanced stages of white rot . For training purposes , the room should include a white board and tackable walls . It combines beautiful aerial photography with historic black and white film clips that tell the story of BPA from the 1930s to the late 1980s .