Different choices values for a single field in inherited class

Hello,                                                                                                                                                                                                             
                                                                                                                                                                                                                   
I'm writing my first webapplication{, in Django} and I'm faced with a                                                                                                                                              
problem that I can't manage alone.                                                                                                                                                                                 
                                                                                                                                                                                                                   
I want to write an application for classifying my wine. There, a wine could                                                                                                                                       
be red or white and regarding this parameter a wine have a more                                                                                                                                                    
specific tone choice, let say for a red wine could be ligth red or                                                                                                                                                 
dark red...                                                                                                                                                                                                        
                                                                                                                                                                                                                   
Here is the idea I want to wrote                                                                                                                                                                                   

$ wine/models.py:
class Color(models.Model):    
        class Meta:                                                                                                                                                                                                      abtract = true                                                                                                                                                                                    
        tone    = models.CharField(max_length = 32, choices = SOMETHING)                                                                                                                                          
class RedColor(Color):                                                                                                                                                                                          R_COLORS = (                                                                                                                                                                                    
               ("Light red",    "light red"),                                                                                                                                                          
               ("Dark red",     "dark red")                                                                                                                                                              )                                                                                                                                                                                                            
 # Tells the parents class that SOMETHING = R_COLORS for red wines              
 
class WhiteColor(Color):                                                                                                                                                                                        W_COLORS = (                                                                                                                                                                                                  ("Ligth white",  "ligth white"),                                                                                                                                                                        ("Dark white",   "dark white")                                                                                                                                                              )                                                                                                                                                                                                                # Tells the parents class that SOMETHING = W_COLORS for white                                                                                                                                  

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
My problems are that I can't manage to write this idea in correct                                                                                                                                                  
Python/Django.                                                                                                                                                                                                     
                                                                                                                                                                                                                   
Also I'm far to be sure that this is the good way of storing this                                                                                                                                                  
information. I'm not sure that 2 tables for storing the same kind of                                                                                                                                               
data is a good way of designing databases.                                                                                                                                                                         
                                                                                                                                                                                                                   
If someone could lead me on some directions it will be great ! 

Thanks                                                                                                                                                   
                                                                                                                                                                                                                   
PS: I will have the same problems on other table on the application,                                                                                                                                               
for example the grappe variety.                                                                                                                                                                                    
                                                                                                                                                                                                                   
PPS: I will have the same problem for building the next application                                                                                                                                                
for classifying my beers.

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