rabck from JennyC1230 via abc bookbox; light "who dunnit", 9th in a series, but read just fine as a standalone. Em is studying in Utah to be a forensic geologist. A friend introduces her to Tert, who wants her to authenticate a painting to determine if it's fake or not, confidentially of course. Paint pigments are just ground up minerals, and she needs a master's thesis after all. Her investigation takes here from Wyoming, where she's living with a friend to DC to meet with the FBI and Art Museum, and finally near my stomping grounds of Lancaster County, which has a fascinating Mennonite history, where she meets with some Pa experts. Artist paints, before synthetics, were made from heavy metals, which are toxins (and that's why there are so many superfund sites in this area - because the minerals were mined with no precautions and metals dumped into the water). A good read. ( )

Our main character is a forensic geologist involved in finding the origin of the toxic minerals used in paints and evaluating these to validate a Remmington.