Where can I find an explanation for what the two colors in degrees of separation mean

Question

In the degrees of separation, explain why the color yellow/gold will begin, turn to green and then back to yellow/gold.  Not sure how to read this

Answer 1

Green are blood relationships, then to yellow for connections that are not related, back to the blood relations before arrival

Comments

When you say back to blood relations before arrival. What does that mean?

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The blood relationships are one colour.  When one lot of blood relatives "runs out", it will use a marriage, then it may go to another line of blood relatives.

I explained it another time with this image (the full size is on click) --