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Posted By: Keith O'Leary

Hi Jeff,

I'm guessing you used tap water and its either Lancaster City water (ours is green here at work ) or it came from a well and is hard. From the sound of things, I'm betting the inside of the card dried before the perimeter because of the capillary action of the water migrating there.

Distilled would have been a safer bet. Maybe try resoaking it in some and sandwich the card between something absorbent and clean to draw the water out as the card dries.