what does mucus color mean
What your SNOT says about your health: Yellow mucus means you have a cold while black gunge is a sign of a fungal infection. 1  Most people produce about 1.7 litres of mucus a day-enough to fill a kettle. 2  As it is made from water, proteins, antibodies and salts, it should be clear.hat your SNOT says about your health: Yellow mucus means you have a cold while black gunge is a sign of a fungal infection. 1  Most people produce about 1.7 litres of mucus a day-enough to fill a kettle. 2  As it is made from water, proteins, antibodies and salts, it should be clear.