The series of photographic operations, developing, washing, final drying, takes about quarter of an hour.

During exposure, interference takes place between the incident rays and those reflected by the mirror, with the formation of interference fringes half a wavelength distant from each other.

I got quite good results from protein plates.

Most of these pictures, taken while travelling, were developed on the mantelpiece of a hotel room, which proves that the method is easy enough to carry out.

The problem of direct colour photography has been facing us since the turn of the last century.

This result is due to a phenomenon of interference which occurs within the sensitive layer.