of troy explains: blue laws refers to set of laws layed down in one of the NE colonies-- that were for some reason-- written on blue paper-- many of the laws concerned alcohol consumption and sale, and what could or could not be done on the sabbath...

Be that as it may, I've always wondered how the theatrical term "going blue" originated to describe the use of profanity onstage. Somehow I subconsciously drew a link between blue laws and going blue, but alas, I have nothing to substantiate my assumption. I suppose ICLIU, but it might make for some interesting conversation... Anyone?