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Colors of Mucus (Phlegm, Sputum). Phlegm may be clear (white), yellow/green, brown, grey, black, pink, orange, containing red streaks, or frothy. Phlegm is mucus (sputum) coughed up from the chest. It reveals inflammation in the respiratory organs below the vocal cords (voice box, windpipe, bronchi and lungs). From the color and density of phlegm, and accompanying symptoms, its cause may be suspected.
1 Cytologic examination of sputum after an asthmatic attack shows eosinophils, Charcot-Leyden crystals (orange, elongated, rhomboid crystals formed by degranulation of eosinophils) and Curshmann's spirals (dark staining core surrounded by lighter mucous). 2  Biopsy is rarely done.