Should read:
Thin-white – Normal
Thick-white – Dampness
Thin-yellow – Heat
Thick-Yellow – Damp-Heat; Pathogenic Factor
Unrooted – Stomach-Qi Deficiency (leading to Yin Deficiency)
Geographic – Stomach-Qi Deficiency (often due to Liver-Qi Stagnation)
Greasy – Damp-Heat
Peeled – Yin Deficiency
Black – Extreme Cold; Extreme Heat; heavy or long-term use of pharmaceutical drugs