(Infusion of 8 grammes with 600 cc of boiling distilled water for 5
minutes.)
Wholesale Proportion
Price Per Per Per of tannin
No. Description and without cent. cent. cent. corresponding
District. duty Extract. Alkaloid. Tannin. to 2·8
per lb. per cent.
Alkaloid.
1 Fine Moning, 1/5 18·80 2·59 3·48 3·76
Hankow
2 Oolong, Formosa 1/1 24·00 2·46 8·76 9·97
3 Souchong -- 18·30 2·60 2·44 2·63
4 Moning 1/1 20·43 2·23 2·96 3·71
5 Scented Orange 1/2 23·81 2·68 7·70 8·04
Pekoe Canton
6 Gunpowder, Green 1/4 29·47 2·55 9·54 10·47
Tea
7 Caper, Green Tea 10³⁄₄d. 21·45 1·87 9·08 13·59
8 Oolong 10d. 23·62 2·47 8·80 9·97
9 Hyson, Green Tea 1/4 26·81 2·32 9·62 11·61
10 Pakling 5¹⁄₄d. 18·77 1·81 3·19 4·93
11 Pekoe Souchong, 1/5 19·31 2·36 2·33 2·76
Lapsang
12 Panyang 4¹⁄₂d. 21·00 1·93 4·71 6·83
13 New make 8¹⁄₂d. 21·78 3·40 6·42 5·28
The last column in the above tables or the proportional amount of
tannin is arrived at in the following manner. I first calculate the
average amount of alkaloid in tea as consumed on a basis of the above
figures. Thus the average amount of alkaloid in Indian teas as seen
in Table H calculates out to 2·84 per cent. This is multiplied by the
proportion of Indian teas on the market, viz. about 60 per cent. in the
same way the average Ceylon alkaloid 2·68 is multiplied by 30, and the
China average 2·40 multiplied by 6. If we add these products together
and divide by 60 + 30 + 6 = 96 this will give us the average percentage
of alkaloid in tea as consumed and this amounts to about 2·8 per cent.
The last column in Tables E, F and G, gives the proportion of tannin
corresponding to 2·8 per cent. alkaloid; that is to say the tannin in
each case is multiplied by 2·8 and divided by the amount of alkaloid
actually present. This figure which represents the proportional amount
of tannin present renders the comparison of the different teas possible
so far as the astringent action is concerned.
The following table summarises the results of analyses of the three
classes of teas:--