Answer: What you're describing is known as fading or blushing. It's a perfectly normal condition. Blushing takes place when red pigment, which develops as the rose opens, fades as the flower ages. It often turns yellow or white, leaving the flower with a spotted appearance. Sometimes a purplish pigment replaces the coral, resulting in a brownish or rust mottled bloom. There's no control for the blushing process, other than to cut away the fading flowers if you find them unattractive.
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