E91 soaking experience
Although I have never soaked an E91, your success will depend on the glue used to adhere the card to the paper. If water soluble glue was used, then you should be okay. Most glues at the turn of the century were water soluble. If they were glued in at a later date (and ther is no way to really know), then you may run into some problems as those glues in many cases are not water soluble. I recently attempted to soak some early 1900's non-sport cards and learned pretty quickly that the cards must have been glued at a later date, as they did not soak well, resulting in paper loss on the back.
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