igo ANIMAL PROTEINS 



It is claimed also that syntans produce a tough leather, 

 and if used for heavy leather in the early stages they give a 

 tough grain and assist in avoiding a cracky grain. On this 

 account they are also recommended for re- tanning E.I . 

 tanned kips. When used in heavy leather suspenders they 

 are said to get rid of lime blast (CaCO 3 ) and to quicken the 

 tannage, i.e. to enable the same weight to be obtained in 

 less time. Procter suggests that a tannage of commercial 

 value might be obtained by blending them with wood pulp 

 extract. 



If used alone for tanning a series of pits containing liquors 

 of 4 to 37 Bkr. may be used, but drum tannages may be 

 given using liquors of i4-29 Bkr., the goods being tanned 

 in 6-8 hours. About 30 per cent, of syntans are said to be 

 necessary for complete tannage. 



REFERENCES. 



E. Stiasny, " A New Synthetic Tannin," Collegium, 1913, 142-145. 

 (See also J. S.C.I., Abs. 1913, 500.) 



E. Stiasny, " Syntans New Artificial Tanning Materials," J.S.C.I., 



3. 775- 



Patents : Austrian 58,405. 



German 262,558, Sept. 12, 1911. 



French 451,875, Dec. 13, 1912; 451,876, Dec. 13, 1912; 

 451.877, Dec. 13, 1912. 



