May be you should try smoking it with a candle. It might help i am not sure. It can be done in many ways , smoking means as simple as showing the paper on top of the flame. Its better to fix it to a wooden frame or cardboard and then showing it upon a flame so as to prevent burning . Showing the paper alone might work but may burn the paper and also takes time since we should take care not to burn it. After smoking the paper we can smudge it with finger or cotton. I am uploading a picture here of a paper piece i smoked right now using a candle without smudging.(only a small portion is smoked).