Where the damaged and ordinary green teas or tea leaves have been prepared with japan earth, or other adulterating ingredients, for the purpose of giving the leaves the colour, and the infusion the tincture of bohea tea, the fraud may be detected by either of the following tests or methods: 1. A less quantity of this dyed tea will give a deeper colour to the same proportion of water than if the experimented articles were genuine. 2. The colour it gives the water will also be of a reddish brown, whereas, if the article be genuine, it should be dark. 3. When the leaves have been washed, by standing a little, they will look greener than good bohea. 4. This dyed tea is generally much larger than the genuine specimens; it is, therefore, always advisable to buy the small leaved bohea; remembering to examine whether the ingenuity of the artist has not been at work to break or crumble it into pieces, so as to disguise the size of the leaves: for the adulterator’s wits are always at work in “the black art.” 5. The liquor drawn off, which should be smooth and balsamic to the palate, tastes rougher and harsher than the genuine tea does. 6. If milk is poured into it, it will rise of a reddish colour, instead of a dark or blackish brown. 7. A little copperas put into this last-mentioned liquor will turn it to a light blue, instead of a deep blue inclining to black. 8. Spirits of hartshorn make good tea of a deep brownish colour, after it has stood awhile, similar to new drawn tincture of saffron; but the same effect does not appear when the tea is bad. When green tea is counterfeited by dyeing bad bohea with green vitriol the cheat may be detected by the following means: 1. By putting a piece of gall into the infusion it will turn it to a deep blackish colour, which would not be the case were vitriol or copperas not present. 2. If the infusion made of this tea be of a pale green, and incline to a blueish dye, it is bad. 3. Spirit of hartshorn will give it a slight purple tinge, and precipitate a small sediment, instead of a deep greenish yellow after it has stood about half a dozen minutes. 4. Where the adulteration has been made with carbonate of copper, the fraud is detected, by shaking up a tea-spoonful of the suspected article in a phial with two tea-spoonsful of liquid ammonia, diluted with half its bulk of water; when the liquor, if copper be present, will exhibit a fine blue colour. Mr. Accum in his work, p. 219-221, gives other methods for testing adulterated tea.