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Without further information, this is my opinion.
Shellac has a tendency to bloom (to turn cloudy) when exposed to humidity. You can see this on a coffee table when it has been shellacked and you place a glass of ice water on it. When you lift a glass there is a white ring left on the table. My understanding is that water is trapped in the shellac and can be easily removed by wiping it down with denatured alcohol. As the alcohol evaporates and removes the water with it. I have no idea how this would help you with works on paper. Unless you're willing to pay a conservator or to experiment with one that you don't particularly care for, I would proceed very cautiously. Good luck.
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