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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.
Frothy sputum is usually a symptom of some form of respiratory distress. Frothing occurs when phlegm or mucus in the lungs combines with fluid and air, and is then coughed up by a person. This is a symptom of several serious conditions, including pulmonary edema, pneumonia, tuberculosis, and even plague.