"Discoverer" of Kinderhook Plates gives recollection of event.
W. P. Harris letter to W. C. Flagg, 25 April 1855, in Journal of the Illinois State Historicity Society 5, no. 2 (July 1912): 271-273
I washed and cleaned the plates and subsequently made an honest affidavit to the same. But since that time, Bridge Whitton said to me that he cut and prepared the plates and he (B. Whitton) and R. Wiley engraved them themselves, and that there was nitric acid put upon them the night before they were found to rust the iron ring and band. And that they were carried to the mound, rubbed in the dirt and carefully dropped into the pit where they were found.