The method of proton-induced X-ray emission (PIXE) was first utilized
to analyze the elements in silk. Different kinds of silk from home and
the wild were examined. The results show that every silk, besides C,
H, O, and N, contains many types of elements such as Si, P, S, Ca, Mn,
Fe, Cu, Zn, and Sr and different samples have different relative cont
ents. (C) 1997 John Wiley & Sons, Inc.