lyo DYEING 



in a skeleton- formula, because it is sometimes para- and sometimes 

 orthoquinonoid. 



\ 



Triarylmethane 

 /\/0\ 



Anthraquinonoid 

 Xanthene 



/\/X\/\ 



I I I I 



II Azines and related dyes 



Haematein 

 Skeleton-formulae of the main groups of quinonoid dyes 



The following table shows the classificatory positions of the 

 quinonoid dyes mentioned in this book. The dyes named in heavy 

 type are the ones that are particularly important in microtechnique. 

 The table is intended for reference. 



TRIARYLMETHANE 



Basic. Basic fuchsine (pararosaniline with ros- 

 aniline), methyl violet, gentian violet, 

 crystal violet, malachite green, dahlia, 

 methyl green, aniline blue (spirit 

 soluble) 



Acid. Acid fuchsine, methyl blue, aniline blue 

 WS, light green 



HAEMATEIN 



Acid. Haematein 



page 

 171 



172 



ANTHRAQUINONOID 



Acid. Alizarine, alizarine red S, purpurine, 

 Kernechtrot, carminic acid 



175 



