Where did the Pictured Rocks National Lakeshore get its name? Those who have kayaked or boated along the shoreline know the answer: from the phenomenal colors of the rocks! The colors are caused by mineral stains in the sandstone: the reds and oranges are from iron, black is from manganese, white is from limonite and green is from copper. The image has been printed on quality luster photo paper by Kathryn. The print has a title and Kathryn’s name on the front. It will arrive unmatted, protected by a clear plastic sleeve, with a sturdy cardboard insert for backing.