[COOT] Edit bond colours in COOT

[Marie Elizabeth Fraser]

Hello,
    Is there a way to change the bond colour for the second (or subsequent) 
chain in a PDB file when the models are represented as Calphas?  I use Edit 
Bond Colours to change the colour of the carbon atoms, so that the first 
subunits (chains A) of the models can be distinguished.  The second subunit in 
every model is pink and I don't know how to change this.
    Thank you,   Marie