Greg,
You can use either a carbon paint or silver paint (dag) to do just what
you want. They are both soluble in acetone. SPI supplies this product.
Here is there web site http://www.2spi.com/.
Best regards,
Jon Hiller
Jon M. Hiller
Electron Microscopy Center
Argonne National Laboratory
9700 South Cass Avenue
Argonne, IL. 60439
Tel: 630-252-9558
Fax: 630-252-4289