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In The Girl with the Curl, Hodgins asks Angela on a swing date.In the episode Aliens in a Spaceship Hodgins admitted to Bones that he was in love with Angela, and Angela kisses him when he is found.He accepts, but their wedding is cut short when it is revealed that Angela was technically already married in Fiji.In season 5, they are arrested because Hodgins is "driving like an old lady" and is sent to jail where they bond and realize that they should not have broken up.Already John Dalton wrote about his color vision deficiency.
Also if you print them out colors are perceived quite differently, specially from colorblind people.
They return from France pregnant in The Mastodon in the Room.
In the end of season 6, Angela has a baby boy, Michael Staccato Vincent Hodgins.
As you can see, not only the base colors red and green cause problems.
It is the mixture of the red part in the colors which makes colors indistinguishable for my eyes.
The first clue to Hodgins' attraction towards Angela occurs in this episode.