Arrow color

Hi, all

I plotted principal stress volume.

So, I have three color arrows; red blue green

I know that they represent the eigenvectors of stress tensor.

What I want to know is their eigenvectors' color


The 1st eigenvector's color is _______.
The 2nd eigenvector's color is _______.
The 3rd eigenvector's color is _______.

I'd like to know this information.

I've failed to find them.

Thank you