1953 Volume 3 Issue 1 Pages 63
On the electron sensitive colour plate reported by E. G. Ramberg, he has thought that two mosaic electron sensitive layers, one of which will develope red and the other green on processing, separated by a thin mettaltlic layer, have response dependent on the velocity of the incident electrons.
Wrighter's experiment on the Ansco colour film showed that the sensitivity of each layer depends not only on the velocity, but also on the intensity of electrons, and in practical electron microscopy, the later is important.
One experiment and the basis of an argument are described in this paper.