Red letter edition
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The term red letter edition is used to describe bibles in which words spoken by Jesus, commonly only while he was on the Earth, are printed in red ink. The red letter edition was invented by Louis Klopsch, then editor of The Christian Herald magazine in 1899, and first published in 1900. This style of bible instantly became popular, and is sometimes favored by Christians in the United States. Especially in King James Bibles, this format can be useful as quotation marks are not used. Also, less common in some study bibles is that which is called "Blue Letter Edition", which in most cases is a bible that emphasizes on the fullfilled prophecies of Christ in blue ink. Called a "Blue Letter Bible" this form of bible is usually used by scholars as these sorts of bibles usually contain a large concordance or the Apocrypha.
The idea of printing the words of Jesus in red originates in the Luke 22:20, which says: This cup is the new testament in my blood, which I shed for you. This inspired Klopsch to ask his mentor what he thought of printing the words spoken by Jesus in red, to which he replied, "It could do no harm and it most certainly could do much good."