X, A, 6 Gana: Leather Industry of the Philippines 365 



Table XVI. — Specific gravities of Filipino tan liquors. 



Sample No. 



Age. 



Contact 

 with 

 pelts. 



Specific 

 gravity. 



1 . . ..... - 



Days. 

 5 

 4 

 6 

 8 

 3 

 6 

 8 



Days. 



1 



1.022 

 1.022 

 1.022 

 1.021 

 1.011 

 1.016 

 1.019 



2 ... 



3 . ... 



4 



5 



5 . . 



6 . . . .- 





7 .. . . 



5 





Analyses of tan liquors are given in Table XVII. 

 Table XVII. — Analyses of Filipino tan liquors. 



6 



s 



0, 



m 



Stage of process. 



Specific 

 grravity. 



Acidity 

 as grams 



acetic 

 acid per 



100 cc. 



Grams per 100 cc. of the liquor. 



Ash. 



Organic 

 matter. 



Sus- 

 pended 

 matter. 



Nontans. 



1 

 Tannin. 



1 

 2 

 3 

 4 



5 



First day 



1.010 

 1.018 

 1.018 

 1.022 



1.019 



0.15 

 0.09 

 0.17 

 0.06 



0.79 

 2.22 

 1.64 

 2.03 



1.59 

 1.64 

 2.41 

 1.86 



0.38 

 0.47 

 1.41 

 (b) 



1.39 

 3.30 

 2.59 

 3.22 



3.20 



0.61 

 («) 



(-) 

 0.67 



0.34 



Fourteenth day 



Third day, 20 per cent 



extra strength. 

 Half completed 











« Trace. 



* Undetermined. 



The tannin in these liquors is strikingly low, and the nontans, 

 especially the mineral matter, are very high, as is to be expected 

 when brackish water is used. The analyses of the ash of Fili- 

 pino tan liquors is given in Table XVIII. 



Table XVIII. — Analyses of the ash of Filipino tan liquors. 



[Grams per 100 cc. of liquor.] 



Sample No. » 



Silica 



(Si02). 



0.006 

 0.009 

 0.030 

 0.008 



Oxides of 

 iron and 

 alumi- 

 nium 

 (Fe203 

 AI2O3). 



0.026 



0.089 

 0.039 



Oxide of 



iron 

 (Fe203). 



0.131 



Calcium 

 oxide 

 (CaO). 



0.061 

 0.093 

 0.133 

 0.135 



Magne- 

 sium 

 oxide 



(MgO). 



0.034 

 0.145 

 0.102 

 0.167 



Sulphu- 

 ric anhy- 

 dride 

 (SO3). 



0.039 

 0.064 

 0.074 

 0.078 



Chloride 

 and car- 

 bonate of 

 sodium 

 plus 

 phospho 

 ric anhy- 

 dride. 



0.62 

 1.77 

 1.21 

 1.60 



» The samples correspond to the tan liquors in the previous table. 

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