Gyotaku is a Japanese method of printing fish dating to the mid 1800s, originally developed for fishermen to record the size and quality of their catches, but it has evolved into its own art form. https://en.wikipedia.org/wiki/Gyotaku
Leslie Charleville uses gyotaku to honor and memorialize animals’ lives, and she has pioneered the use of this technique on the Louisiana Alligator.
Toni R Toivonen buries animal corpses on brass boards and the process of decomposition chemically alters the metal panels.
Metal Patinas by Dissimilar Metal Design
Laguna Gloria Moody Pavillion by Trahan Architects & Dissimilar Metal Design