Well... I dunno if you actually did know why they chose blue... but in case you really don't know, the reason for the blue was because in the early days of black and white photos, the process could caputre most visible spectrums of light except for the color blue... something about the emulsion would render blue marks white, and thus.. invisible. Non Photo blue pencils became a standard in the print industry because you could sketch and ink over the blue marks... and in the final print the blue wouldn't show up.
Then xerox comes along and finds out that blue pen doesn't show up on copies made (because of whatever process that it used at the time) Since in the 70's and early 80's saw xerox machines as a main form of making copies, I'm sure TSR wanted you to buy and not copy thier stuff (pirate's eh?) they made blue a standard for maps in an attempt to keep thier copyrighted stuff from being sold on the black market for pennies they would never see...
This of course, is my theory on the matter....
and Thanks cklarock and ravs![]()



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