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" Life is short and progress is slow. "

Gabriel Lippmann

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" When the shot is afterwards subjected to white light, colour appears because of selective reflection. "

Gabriel Lippmann

" In the case of composite colour, an infinity of systems must be obtained for maxima infinitely slight and with an infinity of interval values separating them - that is to say, the whole thickness of the sensitive layer is occupied in continuous manner by these maxima. "

Gabriel Lippmann

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

Gabriel Lippmann

" 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. "

Gabriel Lippmann

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

Gabriel Lippmann

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

Gabriel Lippmann

" 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. "

Gabriel Lippmann

" I got quite good results from protein plates. "

Gabriel Lippmann

" The length of exposure (one minute in sunlight) is still too long for the portrait. It was fifteen minutes when I first began my work. Progress may continue. "

Gabriel Lippmann