The colours of the various labels plotted on the LIGPLOT diagram can be defined as follows:-
TEXT COLOURS ------------ BLACK <- Plot title BLACK <- Legends in key to symbols BLUE <- Residue names: Ligand residues BRICK RED <- Residue names: Non-ligand residues PURPLE <- Residue names: Water molecule IDs BLACK <- Residue names: Hydrophobic-interaction residues BLACK <- Atom names: Ligand atoms BLACK <- Atom names: Non-ligand atoms OLIVE GREEN <- Hydrogen bond lengths