Addison Darre Crabtre, The Funny Side of Physic
“ All imported tea is black, unless colored before leaving China, and is colored by prussiate of potash—a poison so deleterious as to require labelling in drug stores as “Poison.” It makes one very nervous,—good tea does not, unless used to excess,—and acts as a slow poison on the system. By its over-action on the liver, it makes one yellow, and will spoil the fairest complexion. All teas contain tannic acid, which, combining with milk, makes excellent leather of one. Black teas are sometimes colored with gypsum and Prussian blue. ”
