Ultra-wide field Raman image of rust distribution on the surface oflead plate. Please click to open the file and see the image of 2000pix (Width) by 1170 pix (Height). The pixel size is about 1 um. There are two kinds of rursts on the lead. One is white rust and the other is yellow rust. Both of them are identified with their specific Raman spectra. 

White rust：1050 cm^-1( lead carbonate of base type:2PbCO₃・Pb(OH)₂ ) 
Yellow rust ：280 cm^-1 ( β-PbO)

In the image white rust（1050cm^-1) is epxressed with green color and yellow rust (280cm^-1) is expressed with red color.
Obj; 20x NA=0.45