I'm not sure if this is an appropriate forum for this kind of question, but here goes: I'm looking for a plant with an unusual property. It's an outdoor plant. When placed under water, the leaves, and/or the entire plant, become like silver. Someone showed me this plant many years ago growing near a creek and demonstrated this to me. I recently tried to find the plant but couldn't. If anyone knows of such a plant I would appreciate a name or picture of what this plant looks like. Thanks.
Lots of plants with either a thick glaucous wax layer on the leaves, or dense short water-repellent hairs, will show this. The silvery colour is just air trapped next to the leaf by the wax and/or hairs, causing light to reflect back off the underwater air surface.
Agree with Michael. If you are hoping to find something more specific than that, you'll probably need to try and recall more of what the plant looked like.