CARBON PROCESS

one of the most permanent of photographic printing proce es; based on fact that gelatine, when impregnated with bichromate of potash, becomes insoluble in hot water after exposure to light. By mixing pigments with the gelatine, prints in any color are obtained. ers’), members of secret revolutionary societies in Italy, Spain and Portugal, and France, where they were known as the charbonniers, during early XIX. cent. Amongst members of the Ital. branch were Mizzini, Silvio Pellico, and Lord Byron. Their aims were republican in France, nationalist in Italy; every effort was made by the Austrians to stamp them out in Italy, where they greatly contributed to winning of Ital, freedom.