Tea Made to Order.
There are tea coloring and facing establishments in this country which use for the purpose substances very similar to those used by the Chinese, and they have become so expert of late years that they can turn a black tea into a green (or vice versa) at short notice.
Tea buyers judge quality by the aroma, flavor, and the color and strength of the infusion. They detect vegetable adulterations by the shape and size of the leaf when unrolled, and sometimes burn the leaves and weigh the residue of ash.