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Posted By: David Vargha

The "halo effect" as you call it is from the constant dripping of the water and then letting it dry out. This is the same effect that you get at the bottom of a coffee mug as the little remaining liquid evaporates. There is no such ring when the cup is full. I don't know what the stock is on a Zeenut, but as long as it isn't a photographic plate (like a Fatima) then you should have immersed the card completely in distilled water (virtually no solids) to avoid the stains.

DavidVargha@hotmail.com