This myth states that the origin of the term “blue laws,” (statues regulating work, commerce, and activities on Sundays) comes from the color of the paper on which they were printed. Or the color of the book’s binding.
According to the Encyclopedia Britannica, the term “blue laws” originated in 1781 in A General History of Connecticut where the author, Rev. Samuel Peters, refers to outlandish Connecticut laws of the 17th century, most of which he made up. Some think he may have made up the phrase “blue laws” as well; the Oxford English Dictionary does not provide an earlier use. It does, however, give an earlier meaning of the word “blue”– it meant indecent or rigidly moral, as seen in bluestocking (a woman with literary or intellectual proclivities) or bluenose (person who advocates a rigorous moral code).
On another note, I am unaware of blue writing paper in colonial days–I am unaware of any color other than white or near white–although I have seen blue covers on books of that period.