Percolater
Marksman
- Aug 21, 2012
- 187
- 43
Fingerprints on the tags were eliminated during WWII (Jan 1943) Ink on finger applied to metal, then finely powdered glisonite or asphaltum adhered to the ink until it dried. Heated to a temp slightly above boiling point of water and placed into a solution of nitric acid, hydrochloric acid and water for 1 hour. Imprint completed.