Before Multi came out (late 80s?), it used to be the practice to use board finish on the brown side and decorate (tape and joint) the ivory side. Multi was lauded as a finish that could work on both side of the board.
For years you had to get tech sheets out to convince site agents/builders that you could skim the ivory side( they wouldn't believe what was written on the bag!)
Then it became accepted that you could skim the white side and it became easier to always tack with white side out as it covered all eventualities, so that became the norm
But never ever have I seen any finish to come off the brown side of boards. try it with an off cut of each!
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