To observe the stuff, I didnt do anything harsh to the Allectus to remove it, just remmoved the excess. if its biological, it should continue to grow. There are iron secreting bacteria which deposit iron oxides similar to this and a lot of late roman coins have a high iron content in their bronze alloys.

Only the side exposed to sunlight was effected, so perhaps it is some kind of algae. Which shouldnt happen - the water is distilled, the coins free of organic matter - there is nothing to derive nutrients from. The only explanation is that its deriving important vitamins from metal salts in the water.
A good thing is that I have a good control group - a pot of other coins received recently which have had no contact with that water or that group. Ill leave them somewhere in direct sunlight and see what happens.

Only the side exposed to sunlight was effected, so perhaps it is some kind of algae. Which shouldnt happen - the water is distilled, the coins free of organic matter - there is nothing to derive nutrients from. The only explanation is that its deriving important vitamins from metal salts in the water.
A good thing is that I have a good control group - a pot of other coins received recently which have had no contact with that water or that group. Ill leave them somewhere in direct sunlight and see what happens.



















