It’s not unusual for Bibles produced for general Christian audiences, and especially evangelical Bibles, to have the words spoken by Jesus Christ printed in red ink, to highlight them. While this is a clever and reverent way of drawing attention to the most important aspects of a very long text, there’s a good reason why Bibles printed by the LDS Church could probably never do that.
A lot more than just some of the dialogue in Matthew, Mark, Luke, and John would have to be in red. First, consider that Latter-day Saints know that Jesus was Jehovah, the God of the Old Testament, who spoke with Moses on Sinai. This means that all the “thus saith the Lord” passages of the Old Testament would have to be written in red. For example, everything in Leviticus chapter 1, after the first verse, would be red.
That would be a pretty red-heavy text already, but then consider Doctrine and Covenants 1:38, which says, in part, that the Lord speaks to mankind, “whether by mine own voice or by the voice of my servants, it is the same.” Taking this literally, as we Mormons typically do, suggests that every word in all the scriptures, as inspired writings by authorized prophets and their disciples, could be in red!
Besides losing the novelty of highlighting special text, an all-red Bible would just be creepy…