SEM layer of T55 receiver

This cross section view of the T55 receiver is wonderful.  John Chervinsky supplied this along with several other very informative SEM (scanning electron microscope) images.

You are looking at the inside of the receiver. On the right is space, the top layer is a very thin layer of a substance like gum arabic. Under that is a colloidal silica layer (or sodium silicate) with nucleating particles in it. These appear to be palladium.  Below that is the white baryta layer.  Good stuff! Thanks John.

Look at John's fantastic work, here.