This issued were printed on thin and thick white paper. But the 10$ value only existing on thick white paper. If you have another type of a paper it's a forgery, but actually I believe it's more chemical bleched. Maybe to remove strong toning / yellowing.
The paper and color are quite different and the design is only a very bad imitation. I saw many forgeries of this stamp, this one belongs to the worst type and easy to judge.