Reports of colors

Here is a clear classification of color shades by year and type.

According to [1]

 Weichdruck (fine, smeared print) 
Colour Year Type
lilabraun 1867  Ia
schmutzigbraun   1868 Ia, Ib
grau   Ia, Ib
lilagrau 1869 Ib
lila   Ib, Ic
rotlila 1870 Ib, Ic
mattlila   Ib, Ic
violett 1871 Ib, Ic
grauviolett   Ib, Id, Ie, IIa 
schwarzviolett 1873 IIa
     
Transition from fine to sharp print
Colour Year Type 
dunkellila 1873 IIa 
lila   IIa 
tieflila   IIa 
grauviolett   1874  IIa 
 
     
Hartdruck (Sharp print)
Colour Year Type
hellgraulila 1874 IIa, IIb, If, III 
hellschiefer 1878 III
graulila 1879 III, IIIz,
hellrotlila 1882 III
violettschiefer   1885  III
lila 1886 III
braunlila 1887 III
hellkupferrot 1889 III, IIIa
schokoladen 1890 III, IIIa 
graulila 1891 III, IIIa
grauviolett 1897 III
 

 According to [4]

Coarse print
Type Colour Year
Ia lilabraun 1867
  braungrau 1868
Ib lilabraun 1867
  (bräunlich)grau 1868
  grau  
  lila 1870/71
  (grau)violett 1871/72
Ic (bräunlich)lila 1870
  (dkl')lila 1870
  (grau)violett Anf. 1871
  violettgrau Ende 1871
Id grau 1871/72
  grauviolett 1871/72
Ie graulila 1871/72
  grau 1871/72
  grauviolett 1871/72
IIa (grau)violett 1874
  (grau)violett(1) Mitte 1874
  dunkelviolett 1874
  schwarzviolett Mitte 1874
 (1)Transition from CP to FP
   
Fine print
Type Colour Year
If blaßgraulila  1875 
IIa graulila 1874/78 
  lila 1874/78  
  grauviolett 1874/78 
  violett 1874/78
  bläulichgrau 1874/78
  schwarzviolett 1874/78
IIb blaßgraulila 1875/78 
  (grau)lila 1875/78
IIIz blaßgraulila ab Ende 1876 
IIIa grauviolett ab Ende 1876 
  lila ab Ende 1876 
  bräunlichlila ab Ende 1876 
III graulila ab Ende 1876 
  lila ab Ende 1876 
  grauviolett ab Ende 1876 
  dunkelgrau  
  d'bräunl'violett   1895/96