624  Coloring  of  Various  Tannin  Matters.  {^^S^iKF' 
amined  :  "  Valonia,"  the  acorn  of  Quercus  aegilops  ;  «  Dividivi,"  the 
seed  pods  of  Caesalpinia  coriaria  ;  "  Myrabolans,"  the  unripe  fruit  of 
Terminalia  chebula ;  "  Algarobilla,"  the  seed  pods  of  Caesalpinia 
brevifolia;  pomegranate  rind,  Punica  granatum;  and  gall  nuts,  Quer- 
cus infectoria.  An  exhaustive  investigation  of  these  products  by- 
numerous  methods  showed  that  they  contained  no  member  of  the 
quercetin  or  allied  series,  but  all  were  found  to  depend,  either  directly 
or  indirectly,  upon  ellagic  acid  alone  for  their  dyeing  properties. 
They  are  all  very  similar  in  this  respect.  Experiments  were  made 
with  woollen  cloth  mordanted  with  chromium,  aluminum,  tin  and 
iron.  For  the  sake  of  comparison,  some  of  the  results  were  tabu- 
lated, as  follows : 
Chromium. 
Aluminum. 
Tin. 
Iron. 
KHagic  acid  .  .  . 
Pale  green-olive- 
yellow 
Pale  olive-yellow 
Scarcely  dyed 
Somewhat 
olive -gray -black 
Valonia  nuts  .  .  . 
Green-olive-yellow 
Faint  olive 
Scarcely  dyed 
Weak  gray-black 
Pomegranate  rind 
Yellow-olive 
Faint  olive 
Scarcely  dyed 
Weak  bluish-gray- 
black 
Green-olive 
Faint  olive 
Scarcely  dyed 
Purplish-black 
The  following  table  was  presented  to  show  the  intimate  connec- 
tion between  the  coloring  principles  and  the  tannin  matters  in  the 
plants  examined,  for,  on  decomposition,  the  same  acid,  and,  in  some 
cases,  the  same  phenol  was  obtained  from  both  : 
Tannin. 
Decomposition 
Products  of 
Tannin. 
Coloring 
Matter. 
Decomposition  Pro- 
ducts of  Coloring 
Matter. 
Quebracho  Colo- 
Quebrachotannic 
acid 
Phloroglucinol 
aud  protoeate- 
chuic  acid 
Fisetin 
Resorcinol  and  pro- 
tocatechuic acid 
Rhus  coriaria  .  .  \ 
Rhus  cotinus  .  .  J 
Gallotannic  acid 
Gallic  acid 
Myricetin 
quercetin 
Phloroglucinol  and 
gallic  acid 
Gambier  Catechu  ) 
Acacia  Catechu  j 
Catechin 
Phloroglucinol 
and  protocate- 
chuic  acid 
Myricetin 
quercetin 
Phloroglucinol  and 
protocatechuic  acid 
Acacia  catechu  .  . 
Catechin 
Colpoon  compres- 
A  catechol  tannin 
Protocatechuic 
acid 
Quercetin 
Phloroglucinol  and 
protocatechuic  acid 
Dividivi,  etc.  .  .  . 
Bllagitannic  acid 
Ellagic  acid 
