LEGUMINOS/TL PRODUCING TANNING MATTERS AND DYES 345 



Acacia Cebil (Tree). — Owing to the quantity and excellent quality 

 of the tannin contained in the bark, this tree is one of the most useful 

 of its kind in America. 



Adenanthera pavonina (Tree). — The wood is dried, pulverized and 

 used as a dyestuff. It forms the red paste called tilak which is usc;d 

 by the Brahmins to dye their hair. 



Albizzia Lebbek (Tree). — The bark is used in tanning hides. A 

 sample from Dehra Dun (India) contained ii'33 per cent, of tannin 

 and 4'3 per cent, of soluble non-tannin. The colour of the extract 

 was very deep. An analysis of this bark in Mauritius only gave 

 3' 8 per cent, of tannin. 



Albizzia procera (Tree).— The bark is sometimes used as a tan. 



Entatla scandens (Climbing Shrub). — The bark is used for tanning 

 hides. Another variety, Eiitada africajiUj growing in Africa, serves the 

 same purpose. 



Inga Burgoni (Tree). — The bark of this species, and also that of 

 Inga jinirgiiidtij, forms a tan. 



Mimosa pudica (Shrub). — The roots of the sensitive flant contain 

 about 10 per cent, of tannin. 



Pithecoloblum Avaremotemo (Tree). — In Brazil the pods of this 

 plant are used in dyeing, and the astringent bark in tanning. The 

 pods shrivel into little rolls and are impregnated with a gummy juice. 

 This gum shows a brown outer layer with cracks covered with a 

 white coat which is only present in places ; and a reddish-brown 

 internal layer with longitudinal striations. 



Pithecolobium parvlfoiium (Tree). — This plant goes by the name of 

 algaroville. The fruits contain a fine orange-red dyestuff which is 

 obtained by crushing the pulp (Lanessan.) 



Pithecoloblum Unguls-cati (Tree).— The pods contain a yellow 

 colouring matter used in dyeing. The pericarp is astringent and rich 

 in tannin. 



Prosopis dulcis (Tree). — As much as 20 and 21 per cent, of tannin 

 is obtained from the bark, leaves, and pods of this tree. 



Prosopis splcigera (Tree). — In the Punjab the bark is used as tan. 



Xylia dolabriformis (Tree). — In September, 1896, the Indian 

 Forester drew attention to the possibilities otTered by the wood of this 

 tree. 



An experimental extraction was made in 1897, and as a result 2 tons 

 of shavings gave 97 lb. and 2 tons of sawdust gave 58 lb. of extract. 



According to Professor Procter, the composition of these extracts 

 was as follows : — 



Tannin absorbed by the hide ... ... ... 32 'o per cent. 



Soluble non-tannins ... ... ... ... 4^9 ,, 



Insoluble non-tannins ... ... ... ... 5"0 ,, 



Water... ... ... ... ... ... 58-1 ,, 



I00"0 



Professor Procter concluded that this extract was capable of 

 providing a tanning matter of considerable value. 



