The Frasassi caves. located in the Sentino River Gorge in Ancona Province (Marche. Italy). contains boxwork in a small zone in the inner part of the cave system where it is closely associated with subaqueous corrosion produced by sulfuric acid speleogenesis. https://www.spidertattooz.com/SNS-Dipping-Powder-Trendy-Grey-1-oz-NOS21-p35616/