Leather Chemists Pocket book a Short Compendium of Analytical Methods
Leather Chemists Pocket book a Short Compendium of Analytical Methods
H R Henry Richardson Procter
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Group la. Group \b. Confirming tests : + iron alum green bluish violet 5 c. C. Tannin solu- tion (0*4 per cent. ) + acetic acid lead - ace- tate test. The filtrate of the pp. Gives + iron alum 5 c. C. Tannin solution (0-4 per cent. ) + bromine test pp. No pp. Group Group IILz. IIL*. no dis- distinct tinct color- color- ation ation Group Group 110. Lib. F 2 68 LEATHER CHEMISTS' POCKET BOOK 93- Formaldehyde-test (par. 64) Bromine- test (par. 63) Ammonium- sulphide- test (par. 65) Lead- acetate-te...st (par. 61) Filtrate + NaOH During 15 min. Boiling Filtrate + iron alum + sodium acetate Quebracho . pp. no colora- tion pp. no pp. yellowish Sulphited Quebracho " " (par. 73) " 11 Mangrove . jj pp. jj colourless Ulmo . ; . jj yellowish Gambier . , jj jj jj Mimosa . . jj jj j, pp. colourless Oakbark . . jj violet , jj jj Hemlock Pistacia . Chestnut . . jj jj no pp. no colora- tion deep bluish violet jj no pp. pp. (after standing over night) pp. yellowish yellow colourless Oakwood , j j jj jj Myrobalans .
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