Colour is an Optional Feature of BOVS Diagrams. Colour can be used to make ownership and control information easier to see at a glance.
Ownership and control information should each be assigned a distinct colour. They may be any colours you like, so long as they contrast well. Ownership and control information must then be shown in these colours consistently across your diagram.
You should now think of each Arrow as consisting of two half-arrows, one half for the ownership part of the interest and one half for the control part. Which half is which follows the Chirality rule, that is:
Colour each half-arrow using your chosen colours for ownership and control.
Arrows should always have a complete end cap, even if they only represent one type of interest.
You may choose any two colours to use; we expect different organisations to use their own brand colours. The standard used by OpenOwnership is:
Selecting colours that are close to this pattern may be worthwhile, to increase the likelihood that your readers will have come across the same colour scheme before.
So that the colours chosen for ownership and control stand out, and the significance of colour in the diagram is clear, you should refrain from using bold colours for any other parts of your diagram.